Low-temperature-resistant wading rubber sealing ring and preparation method thereof

Abstract

The application relates to the technical field of rubber materials, and discloses a low-temperature-resistant water-involved rubber sealing ring and a preparation method thereof. The low-temperature-resistant water-involved rubber sealing ring comprises the following components by weight: chloroprene rubber 72-80 parts, styrene butadiene rubber 30-40 parts, chloroether rubber 15-20 parts, polyurethane elastomer 5-10 parts, carbon black 20-30 parts, anti-aging agent 0.2-1 part, vulcanization aid 2-3 parts, vulcanizing agent 1-2 parts, compatibilizer 1-3 parts and low-temperature-resistant plasticizer 2-4 parts; wherein the low-temperature-resistant plasticizer comprises diethylene glycol tert-butyl ether, octyl epoxy stearate and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 1-2:10:1. The above technical scheme solves the problem of poor low-temperature resistance of the water-involved rubber sealing ring in the related art.

Description

Technical Field

[0001] This invention relates to the field of rubber materials technology, specifically to a low-temperature resistant water-resistant rubber sealing ring and its preparation method. Background Technology

[0002] Rubber sealing rings, as core sealing elements in water-related engineering and equipment fields such as water supply and drainage pipelines, pumps and valves, underwater detection equipment, and ship pipelines, play a crucial role in preventing water leakage and maintaining the sealing and pressure resistance of equipment and pipelines. They are fundamental components ensuring the stable operation of the entire water-related system. Especially in low-temperature water-related applications such as chilled water circulation systems, the rubber matrix is ​​prone to hardening and embrittlement under long-term low-temperature environments, and may even experience failures such as cracking and breakage. However, most commonly used water-related rubber sealing rings in current technologies use general-purpose rubbers such as natural rubber and styrene-butadiene rubber as the matrix material. Their formulation design often focuses more on conventional properties such as water resistance, with insufficient optimization of low-temperature resistance. This results in poor low-temperature performance of these sealing rings, making it difficult to meet the actual application requirements of low-temperature water-related conditions. Therefore, it is necessary to propose a low-temperature resistant water-related rubber sealing ring and its preparation method. Summary of the Invention

[0003] This invention proposes a low-temperature resistant water-resistant rubber sealing ring and its preparation method, which solves the problem of poor low-temperature resistance of water-resistant rubber sealing rings in related technologies.

[0004] The technical solution of the present invention is as follows:

[0005] This invention proposes a low-temperature resistant water-resistant rubber sealing ring, comprising the following raw materials in parts by weight: 72-80 parts of chloroprene rubber, 30-40 parts of styrene-butadiene rubber, 15-20 parts of chloroprene rubber, 5-10 parts of polyurethane elastomer, 20-30 parts of carbon black, 0.2-1 part of antioxidant, 2-3 parts of vulcanizing aid, 1-2 parts of vulcanizing agent, 1-3 parts of compatibilizer, and 2-4 parts of low-temperature resistant plasticizer;

[0006] The low-temperature resistant plasticizer comprises diethylene glycol tert-butyl ether, octyl epoxy stearate, and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 1~2:10:1.

[0007] As a further technical solution, the mass ratio of diethylene glycol tert-butyl ether, octyl epoxy stearate, and fatty alcohol polyoxyethylene ether phosphate is 1.5:10:1.

[0008] As a further technical solution, the mass ratio of the chloroprene rubber, styrene-butadiene rubber and chloroprene rubber is 4~5:2:1, preferably 4.5:2:1.

[0009] As a further technical solution, the fatty alcohol polyoxyethylene ether phosphate is designated as AEO-3P.

[0010] As a further technical solution, the polyurethane elastomer includes a first polyurethane elastomer and a second polyurethane elastomer, wherein the first polyurethane elastomer and the second polyurethane elastomer have different hardnesses.

[0011] As a further technical solution, the hardness of the first polyurethane elastomer is 92 Shore A, and the hardness of the second polyurethane elastomer is 70 Shore A.

[0012] This invention enhances the mechanical strength of rubber sealing rings by compounding a first polyurethane elastomer and a second polyurethane elastomer with different hardnesses. The first polyurethane elastomer, with its higher hardness, has a higher proportion of rigid segments (hard segments). The urea groups and other groups in its molecular chain can form hydrogen bonds with the ether bonds and other groups on the chloroprene rubber molecular chain, enhancing the interaction between the two phase molecules and the interfacial bonding force. The second polyurethane elastomer, with its lower hardness, has a higher proportion of flexible segments (soft segments), possessing good deformation ability. It can more effectively fill the gaps in the blend phase interface and cross-linked network, reducing stress concentration. The two work synergistically to improve the mechanical strength of the water-resistant rubber sealing ring.

[0013] As a further technical solution, the mass ratio of the first polyurethane elastomer to the second polyurethane elastomer is 2~4:1.

[0014] As a further technical solution, the antioxidant includes one or two of antioxidant 4010NA and antioxidant RD.

[0015] As a further technical solution, the vulcanization aid is dibenzothiazole disulfide.

[0016] As a further technical solution, the vulcanizing agent is composed of magnesium oxide, zinc oxide and sulfur in a mass ratio of 5:4:1.

[0017] As a further technical solution, the compatibilizer is a maleic anhydride-grafted ethylene-octene copolymer.

[0018] This invention proposes a method for preparing a low-temperature resistant water-resistant rubber sealing ring, comprising the following steps:

[0019] S1. Chloroprene rubber, polyurethane elastomer and compatibilizer are mixed and then compounded to obtain a blend;

[0020] S2. Mix the blended rubber with styrene-butadiene rubber, chlorinated rubber, antioxidant, and carbon black. After the first stage of mixing, add a low-temperature resistant plasticizer and perform the second stage of mixing to obtain the mixed rubber compound.

[0021] S3. The mixed rubber compound is then subjected to final mixing with vulcanizing agent and vulcanizing aid to obtain mixed rubber.

[0022] S4. Place the compounded rubber in a mold and vulcanize it to obtain a low-temperature resistant water-resistant rubber sealing ring.

[0023] As a further technical solution, in step S1, the mixing temperature is 65~75℃ and the time is 3~4min.

[0024] As a further technical solution, in step S4, during the vulcanization molding, the vulcanization temperature is 150~160℃, the vulcanization pressure is 15~20MPa, and the vulcanization time is 15~25min.

[0025] The working principle and beneficial effects of this invention are as follows:

[0026] This invention improves the low-temperature resistance of water-resistant rubber seals by adding a low-temperature resistant plasticizer composed of diethylene glycol tert-butyl ether, octyl epoxy stearate, and fatty alcohol polyoxyethylene ether phosphate. Octyl epoxy stearate, as the primary plasticizer, has a long-chain ester structure that can embed between rubber molecular chains, increasing the inter-segment spacing and reducing intermolecular forces, thereby improving the low-temperature resistance of the water-resistant rubber seal. Diethylene glycol tert-butyl ether, as an auxiliary low-temperature resistant plasticizer, can synergistically enhance the low-temperature resistance of the seal with octyl epoxy stearate. However, due to differences in molecular structure and polarity, direct compounding of the two plasticizers easily leads to phase separation, making it difficult to achieve the synergistic effect of low-temperature plasticizing. Fatty alcohol polyoxyethylene ether phosphate, on the other hand, can reduce the interfacial tension between the primary and auxiliary plasticizers and the rubber matrix, promoting uniform dispersion and fusion of the two in the rubber matrix. This allows the synergistic effect of the primary and auxiliary plasticizers to be fully utilized, further improving the low-temperature resistance of the water-resistant rubber seal. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] In the following examples and comparative examples, the following materials are used: chloroprene rubber, model CR248; styrene-butadiene rubber, model SBR1502; chloroprene rubber, model JHH-LM72; first polyurethane elastomer, hardness 92 Shore A, model 690AU; second polyurethane elastomer, hardness 70 Shore A, model C70AW; carbon black, model N550; fatty alcohol polyoxyethylene ether phosphate, model AEO-3P; maleic anhydride grafted ethylene-octene copolymer, grade Dow N216; and vulcanizing agent composed of magnesium oxide, zinc oxide, and sulfur in a mass ratio of 5:4:1.

[0029] Example 1

[0030] A low-temperature resistant water-resistant rubber sealing ring comprises the following raw materials in parts by weight: 75 parts chloroprene rubber, 30 parts styrene-butadiene rubber, 15 parts chloroprene rubber, 5 parts polyurethane elastomer, 20 parts carbon black, 0.2 parts antioxidant 4010NA, 2 parts dibenzothiazole disulfide, 1 part vulcanizing agent, 2 parts low-temperature resistant plasticizer, and 1 part maleic anhydride-grafted ethylene-octene copolymer; wherein the low-temperature resistant plasticizer comprises diethylene glycol tert-butyl ether, octyl epoxy stearate, and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 1:10:1; the polyurethane elastomer is a first polyurethane elastomer;

[0031] A method for preparing a low-temperature resistant water-resistant rubber sealing ring includes the following steps:

[0032] S1. After mixing chloroprene rubber, polyurethane elastomer and maleic anhydride-grafted ethylene-octene copolymer, the mixture is kneaded at 65°C for 4 minutes to obtain a blend.

[0033] S2. Mix the blended rubber with styrene-butadiene rubber, chloroprene rubber, antioxidant 4010NA, and carbon black. After the first stage of mixing, add the low-temperature plasticizer and carry out the second stage of mixing to obtain the mixed rubber compound.

[0034] S3. The mixed rubber compound is then mixed with vulcanizing agent and dibenzothiazole disulfide in the final stage to obtain the compounded rubber.

[0035] S4. Place the compounded rubber in a mold and vulcanize it at a temperature of 150℃, a pressure of 15MPa, and a time of 25min to obtain a low-temperature resistant water-resistant rubber sealing ring.

[0036] Example 2

[0037] A low-temperature resistant water-resistant rubber sealing ring comprises the following raw materials in parts by weight: 72 parts chloroprene rubber, 32 parts styrene-butadiene rubber, 16 parts chloroprene rubber, 8 parts polyurethane elastomer, 25 parts carbon black, 0.6 parts antioxidant RD, 2.5 parts dibenzothiazole disulfide, 1.5 parts vulcanizing agent, 3 parts low-temperature resistant plasticizer, and 2 parts maleic anhydride-grafted ethylene-octene copolymer; wherein the low-temperature resistant plasticizer comprises diethylene glycol tert-butyl ether, octyl epoxy stearate, and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 1:10:1; the polyurethane elastomer is a first polyurethane elastomer;

[0038] A method for preparing a low-temperature resistant water-resistant rubber sealing ring includes the following steps:

[0039] S1. After mixing chloroprene rubber, polyurethane elastomer and maleic anhydride-grafted ethylene-octene copolymer, the mixture is kneaded at 70°C for 4 minutes to obtain a blend.

[0040] S2. Mix the blended rubber with styrene-butadiene rubber, chloroprene rubber, antioxidant RD, and carbon black. After the first stage of mixing, add the low-temperature plasticizer and carry out the second stage of mixing to obtain the mixed rubber compound.

[0041] S3. The mixed rubber compound is then mixed with vulcanizing agent and dibenzothiazole disulfide in the final stage to obtain the compounded rubber.

[0042] S4. Place the rubber compound in a mold and vulcanize it at a temperature of 155℃, a pressure of 18MPa, and a time of 20min to obtain a low-temperature resistant water-resistant rubber sealing ring.

[0043] Example 3

[0044] A low-temperature resistant water-resistant rubber sealing ring comprises the following raw materials in parts by weight: 80 parts chloroprene rubber, 40 parts styrene-butadiene rubber, 20 parts chloroprene rubber, 10 parts polyurethane elastomer, 30 parts carbon black, 0.5 parts antioxidant 4010NA, 0.5 parts antioxidant RD, 3 parts dibenzothiazole disulfide, 2 parts vulcanizing agent, 4 parts low-temperature resistant plasticizer, and 3 parts maleic anhydride-grafted ethylene-octene copolymer; wherein the low-temperature resistant plasticizer comprises diethylene glycol tert-butyl ether, octyl epoxy stearate, and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 1:10:1; the polyurethane elastomer is a first polyurethane elastomer;

[0045] A method for preparing a low-temperature resistant water-resistant rubber sealing ring includes the following steps:

[0046] S1. After mixing chloroprene rubber, polyurethane elastomer and maleic anhydride-grafted ethylene-octene copolymer, the mixture is kneaded at 75°C for 3 minutes to obtain a blend.

[0047] S2. Mix the blended rubber with styrene-butadiene rubber, chloroprene rubber, antioxidant 4010NA, antioxidant RD, and carbon black. After the first stage of mixing, add the low-temperature plasticizer and carry out the second stage of mixing to obtain the mixed rubber compound.

[0048] S3. The mixed rubber compound is then mixed with vulcanizing agent and dibenzothiazole disulfide in the final stage to obtain the compounded rubber.

[0049] S4. Place the compounded rubber in a mold and vulcanize it at a temperature of 160℃, a pressure of 20MPa, and a time of 15min to obtain a low-temperature resistant water-resistant rubber sealing ring.

[0050] Example 4

[0051] A low-temperature resistant water-resistant rubber sealing ring comprises the following raw materials in parts by weight: 75 parts chloroprene rubber, 30 parts styrene-butadiene rubber, 15 parts chloroprene rubber, 5 parts polyurethane elastomer, 20 parts carbon black, 0.2 parts antioxidant 4010NA, 2 parts dibenzothiazole disulfide, 1 part vulcanizing agent, 2 parts low-temperature resistant plasticizer, and 1 part maleic anhydride-grafted ethylene-octene copolymer; wherein the low-temperature resistant plasticizer comprises diethylene glycol tert-butyl ether, octyl epoxy stearate, and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 1.5:10:1; the polyurethane elastomer is a first polyurethane elastomer;

[0052] A method for preparing a low-temperature resistant water-resistant rubber sealing ring is the same as in Example 1.

[0053] Example 5

[0054] A low-temperature resistant water-resistant rubber sealing ring comprises the following raw materials in parts by weight: 75 parts chloroprene rubber, 30 parts styrene-butadiene rubber, 15 parts chloroprene rubber, 5 parts polyurethane elastomer, 20 parts carbon black, 0.2 parts antioxidant 4010NA, 2 parts dibenzothiazole disulfide, 1 part vulcanizing agent, 2 parts low-temperature resistant plasticizer, and 1 part maleic anhydride-grafted ethylene-octene copolymer; wherein the low-temperature resistant plasticizer comprises diethylene glycol tert-butyl ether, octyl epoxy stearate, and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 2:10:1; the polyurethane elastomer is a first polyurethane elastomer;

[0055] A method for preparing a low-temperature resistant water-resistant rubber sealing ring is the same as in Example 1.

[0056] Example 6

[0057] A low-temperature resistant water-resistant rubber sealing ring comprises the following raw materials in parts by weight: 75 parts chloroprene rubber, 30 parts styrene-butadiene rubber, 15 parts chloroprene rubber, 5 parts polyurethane elastomer, 20 parts carbon black, 0.2 parts antioxidant 4010NA, 2 parts dibenzothiazole disulfide, 1 part vulcanizing agent, 2 parts low-temperature resistant plasticizer, and 1 part maleic anhydride-grafted ethylene-octene copolymer; wherein the low-temperature resistant plasticizer comprises diethylene glycol tert-butyl ether, octyl epoxy stearate, and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 1:10:1; the polyurethane elastomer is composed of a first polyurethane elastomer and a second polyurethane elastomer in a mass ratio of 2:1.

[0058] A method for preparing a low-temperature resistant water-resistant rubber sealing ring is the same as in Example 1.

[0059] Example 7

[0060] A low-temperature resistant water-resistant rubber sealing ring comprises the following raw materials in parts by weight: 75 parts chloroprene rubber, 30 parts styrene-butadiene rubber, 15 parts chloroprene rubber, 5 parts polyurethane elastomer, 20 parts carbon black, 0.2 parts antioxidant 4010NA, 2 parts dibenzothiazole disulfide, 1 part vulcanizing agent, 2 parts low-temperature resistant plasticizer, and 1 part maleic anhydride-grafted ethylene-octene copolymer; wherein the low-temperature resistant plasticizer comprises diethylene glycol tert-butyl ether, octyl epoxy stearate, and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 1:10:1; the polyurethane elastomer is composed of a first polyurethane elastomer and a second polyurethane elastomer in a mass ratio of 3:1.

[0061] A method for preparing a low-temperature resistant water-resistant rubber sealing ring is the same as in Example 1.

[0062] Example 8

[0063] A low-temperature resistant water-resistant rubber sealing ring comprises the following raw materials in parts by weight: 75 parts chloroprene rubber, 30 parts styrene-butadiene rubber, 15 parts chloroprene rubber, 5 parts polyurethane elastomer, 20 parts carbon black, 0.2 parts antioxidant 4010NA, 2 parts dibenzothiazole disulfide, 1 part vulcanizing agent, 2 parts low-temperature resistant plasticizer, and 1 part maleic anhydride-grafted ethylene-octene copolymer; wherein the low-temperature resistant plasticizer comprises diethylene glycol tert-butyl ether, octyl epoxy stearate, and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 1:10:1; the polyurethane elastomer is composed of a first polyurethane elastomer and a second polyurethane elastomer in a mass ratio of 4:1.

[0064] A method for preparing a low-temperature resistant water-resistant rubber sealing ring is the same as in Example 1.

[0065] Example 9

[0066] A low-temperature resistant water-resistant rubber sealing ring comprises the following raw materials in parts by weight: 75 parts chloroprene rubber, 30 parts styrene-butadiene rubber, 15 parts chloroprene rubber, 5 parts polyurethane elastomer, 20 parts carbon black, 0.2 parts antioxidant 4010NA, 2 parts dibenzothiazole disulfide, 1 part vulcanizing agent, 2 parts low-temperature resistant plasticizer, and 1 part maleic anhydride-grafted ethylene-octene copolymer; wherein the low-temperature resistant plasticizer comprises diethylene glycol tert-butyl ether, octyl epoxy stearate, and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 1:10:1; the polyurethane elastomer is a second polyurethane elastomer;

[0067] A method for preparing a low-temperature resistant water-resistant rubber sealing ring is the same as in Example 1.

[0068] Comparative Example 1

[0069] A low-temperature resistant water-resistant rubber sealing ring comprises the following raw materials in parts by weight: 75 parts chloroprene rubber, 30 parts styrene-butadiene rubber, 15 parts chloroprene rubber, 5 parts polyurethane elastomer, 20 parts carbon black, 0.2 parts antioxidant 4010NA, 2 parts dibenzothiazole disulfide, 1 part vulcanizing agent, 2 parts low-temperature resistant plasticizer, and 1 part maleic anhydride-grafted ethylene-octene copolymer; wherein the low-temperature resistant plasticizer comprises octyl epoxy stearate and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 10:1; the polyurethane elastomer is a first polyurethane elastomer;

[0070] A method for preparing a low-temperature resistant water-resistant rubber sealing ring is the same as in Example 1.

[0071] Comparative Example 2

[0072] A low-temperature resistant water-resistant rubber sealing ring comprises the following raw materials in parts by weight: 75 parts chloroprene rubber, 30 parts styrene-butadiene rubber, 15 parts chloroprene rubber, 5 parts polyurethane elastomer, 20 parts carbon black, 0.2 parts antioxidant 4010NA, 2 parts dibenzothiazole disulfide, 1 part vulcanizing agent, 2 parts low-temperature resistant plasticizer, and 1 part maleic anhydride-grafted ethylene-octene copolymer; wherein the low-temperature resistant plasticizer comprises diethylene glycol tert-butyl ether and epoxy stearate in a mass ratio of 1:10; the polyurethane elastomer is a first polyurethane elastomer;

[0073] A method for preparing a low-temperature resistant water-resistant rubber sealing ring is the same as in Example 1.

[0074] Comparative Example 3

[0075] A low-temperature resistant water-resistant rubber sealing ring comprises the following raw materials in parts by weight: 75 parts chloroprene rubber, 30 parts styrene-butadiene rubber, 15 parts chloroprene rubber, 5 parts polyurethane elastomer, 20 parts carbon black, 0.2 parts antioxidant 4010NA, 2 parts dibenzothiazole disulfide, 1 part vulcanizing agent, 2 parts low-temperature resistant plasticizer, and 1 part maleic anhydride-grafted ethylene-octene copolymer; wherein the low-temperature resistant plasticizer is octyl epoxy stearate; and the polyurethane elastomer is a first polyurethane elastomer.

[0076] A method for preparing a low-temperature resistant water-resistant rubber sealing ring is the same as in Example 1.

[0077] The test samples were prepared according to the raw materials and preparation methods of Examples 1-9 and Comparative Examples 1-3 above, and tested according to the following methods:

[0078] 1. Low temperature resistance: According to GB / T 15256-2014 "Determination of low temperature brittleness of vulcanized rubber or thermoplastic rubber (multiple sample method)", the brittleness temperature of the rubber gasket is measured when using procedure A, and the sample type is type A.

[0079] 2. Tensile strength test: The tensile strength was tested in accordance with GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber". The specimen was a type 1A dumbbell-shaped specimen with a thickness of 2.0 mm and the clamp moving speed was 500 mm / min.

[0080] The test results are shown in Tables 1 and 2:

[0081] Table 1. Test results of low-temperature resistance of water-contact rubber sealing rings

[0082]

[0083] The data in Table 1 show that the addition of a low-temperature resistant plasticizer composed of diethylene glycol tert-butyl ether, octyl epoxy stearate, and fatty alcohol polyoxyethylene ether phosphate can improve the low-temperature resistance of water-contaminated rubber seals.

[0084] Table 2. Tensile property test results of water-resistant rubber seals

[0085]

[0086] The data in Table 2 show that the addition of polyurethane elastomers composed of a first polyurethane elastomer and a second polyurethane elastomer with different hardness can improve the tensile strength of the water-contact rubber seal.

[0087] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-temperature resistant, water-resistant rubber sealing ring, characterized in that, The raw materials include the following components in parts by weight: 72-80 parts of chloroprene rubber, 30-40 parts of styrene-butadiene rubber, 15-20 parts of chloroprene rubber, 5-10 parts of polyurethane elastomer, 20-30 parts of carbon black, 0.2-1 part of antioxidant, 2-3 parts of vulcanizing aid, 1-2 parts of vulcanizing agent, 1-3 parts of compatibilizer, and 2-4 parts of low-temperature plasticizer; The low-temperature resistant plasticizer comprises diethylene glycol tert-butyl ether, octyl epoxy stearate, and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 1~2:10:

1.

2. The low-temperature resistant water-resistant rubber sealing ring according to claim 1, characterized in that, The mass ratio of the chloroprene rubber, styrene-butadiene rubber, and chloroprene rubber is 4~5:2:

1.

3. The low-temperature resistant water-resistant rubber sealing ring according to claim 1, characterized in that, The fatty alcohol polyoxyethylene ether phosphate is designated as AEO-3P.

4. The low-temperature resistant water-resistant rubber sealing ring according to claim 1, characterized in that, The polyurethane elastomer includes a first polyurethane elastomer and a second polyurethane elastomer, and the first polyurethane elastomer and the second polyurethane elastomer have different hardnesses.

5. The low-temperature resistant water-resistant rubber sealing ring according to claim 4, characterized in that, The first polyurethane elastomer has a hardness of 92 Shore A, and the second polyurethane elastomer has a hardness of 70 Shore A.

6. The low-temperature resistant water-resistant rubber sealing ring according to claim 5, characterized in that, The mass ratio of the first polyurethane elastomer to the second polyurethane elastomer is 2~4:

1.

7. The low-temperature resistant water-resistant rubber sealing ring according to claim 1, characterized in that, The antioxidant includes one or both of antioxidant 4010NA and antioxidant RD.

8. A method for preparing a low-temperature resistant water-resistant rubber sealing ring, used to prepare a low-temperature resistant water-resistant rubber sealing ring as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Chloroprene rubber, polyurethane elastomer and compatibilizer are mixed and then compounded to obtain a blend; S2. Mix the blended rubber with styrene-butadiene rubber, chlorinated rubber, antioxidant, and carbon black. After the first stage of mixing, add a low-temperature resistant plasticizer and perform the second stage of mixing to obtain the mixed rubber compound. S3. The mixed rubber compound is then mixed with vulcanizing agent and vulcanizing aid in the final stage to obtain the mixed rubber compound. S4. Place the compounded rubber in a mold and vulcanize it to obtain a low-temperature resistant water-resistant rubber sealing ring.

9. The method for preparing a low-temperature resistant water-resistant rubber sealing ring according to claim 8, characterized in that, In step S1, the mixing temperature is 65~75℃ and the time is 3~4 minutes.

10. The method for preparing a low-temperature resistant water-resistant rubber sealing ring according to claim 8, characterized in that, In step S4, during the vulcanization molding process, the vulcanization temperature is 150~160℃, the vulcanization pressure is 15~20MPa, and the vulcanization time is 15~25min.

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