EPDM rubber cup lubricant and preparation method thereof

Abstract

The present application relates to an EPDM rubber cup lubricant and a preparation method thereof, which comprises, by mass percentage, 65-80% polyethylene glycol; 10-25% triethylene glycol monomethyl ether borate; 5% to 10% low molecular weight polyether; 2.5-5% friction reducer; 1-3% antioxidant; 0.1-0.3% preservative; and 0.5-4% anti-swelling agent. The lubricant provided in the embodiment of the present application, the base oil comprises polyethylene glycol, triethylene glycol monomethyl ether borate and low molecular weight polyether, and has good low temperature fluidity after compounding, and its kinematic viscosity at -40°C is less than 1000mm 2 / s. It has excellent compatibility with EPDM rubber in brake fluid, with a volume increase of less than 1%, which is similar to brake fluid; it has good friction reduction performance, with a friction coefficient of less than 0.13, which is equivalent to grease; the hydrogen ion concentration index PH value is 7-7.2, which is neutral and will not corrode human skin.

Description

Technical Field

[0001] The present application relates to the field of material technology, and in particular to an EPDM rubber cup lubricant and a preparation method thereof. Background Art

[0002] Rubber cups can play a role in pressure transmission and sealing in the clutch control system and hydraulic brake system of vehicles. At present, most rubber cups on the market are made of EPDM, SBR and NBR materials, among which EPDM has the best adaptability in brake fluid and is widely used by manufacturers.

[0003] In the early days, the assembly of EPDM rubber cups generally adopted the assembly process of applying brake fluid lubrication. The use of brake fluid as the lubricating medium can ensure its compatibility with the EPDM rubber material. However, the average pH value of the brake fluid is between 8-9.5. The high pH value will cause corrosion to the skin of on-site assembly operators. At the same time, the lubricity of brake fluid is worse than that of grease.

[0004] For occupational health and environmental protection reasons, some manufacturers later began to adopt the assembly process of applying grease. However, with the widespread use of grease, its disadvantages also emerged: as an oil-based lubricant, although grease is insoluble in brake fluid, it has poor adaptability to EPDM rubber materials in brake fluid, because EPDM rubber is not oil-resistant, and the grease component contains 80%-95% base oil, which directly leads to 8%-12% volume swelling of the EPDM rubber cup, causing the clutch and brake master cylinder piston of the car using brake fluid to get stuck due to the swelling of the cup, and it cannot be used as the best lubricating material.

[0005] The above are all problems that need to be solved urgently during the assembly of automobile clutch and brake pump assembly. Summary of the invention

[0006] The embodiment of the present application provides an EPDM rubber cup lubricant and a preparation method thereof to solve the problem in the related art that brake fluid as a lubricating medium will corrode the skin of assembly operators, and grease will cause the EPDM rubber cup to swell in volume by 8%-12%.

[0007] In a first aspect, an EPDM rubber cup lubricant is provided, which comprises, calculated by mass percentage:

[0008] 65-80% polyethylene glycol; 10-25% triethylene glycol monomethyl ether borate; 5% to 10% low molecular weight polyether; 2.5-5% friction reducer; 1-3% antioxidant; 0.1-0.3% preservative; 0.5-4% anti-swelling agent.

[0009] In some embodiments, the low molecular weight polyether includes one or more of propylene glycol block polyether and diethylene glycol monobutyl ether, and the average molecular weight of the propylene glycol block polyether is lower than 1300.

[0010] In some embodiments, the friction reducer includes one or more of triethanolamine oleic acid soap and dioctyl basic zinc salt of thiophosphate;

[0011] And / or, the friction coefficient of the friction reducer is less than 0.13N / m 2 .

[0012] In some embodiments, the antioxidant includes one or more of diisopropanolamine and 2,6-di-tert-butyl-p-cresol;

[0013] And / or, the antioxidant performance of the antioxidant is under the conditions of 70°C ± 2°C, 168h ± 2h, no visible pitting, pitting and colloid precipitation, and the weight change of the cast iron sheet is less than ± 0.1mg / cm 2 ; The weight change of aluminum sheet is less than ±0.03mg / cm 2 .

[0014] In some embodiments, the preservative includes one or more of methyl benzotriazole, benzotriazole and ammonium benzoate;

[0015] And / or, the anti-corrosion performance of the preservative is that under the conditions of 100°C ± 2°C and 120h ± 2h, there is no visible discoloration, pitting and surface roughness; the weight change of tinplate is less than ± 0.05mg / cm 2 ; Steel sheet weight change is less than ±0.05mg / cm 2 ; Cast iron sheet weight change is less than ±0.05mg / cm 2 ; The weight change of aluminum sheet is less than ±0.02mg / cm 2 ; Brass sheet weight change is less than ±0.02mg / cm 2 ; The weight change of copper sheet is less than ±0.02mg / cm 2 ; Zinc sheet weight change is less than ±0.02mg / cm 2 .

[0016] In some embodiments, the anti-swelling agent includes one or more of 2-hydroxysuccinic acid and DL-2-aminosuccinic acid;

[0017] And / or, the volume increase value of the anti-swelling agent for the rubber adaptability of the brake fluid of EPDM rubber is less than 1%.

[0018] In a second aspect, a method for preparing any of the above-mentioned EPDM rubber cup lubricants is provided, comprising the following steps:

[0019] After the polyethylene glycol is heated to a first temperature, triethylene glycol monomethyl ether borate is added, and the temperature is raised to a second temperature and mixed evenly; after cooling to a third temperature, a low molecular weight polyether is added and mixed evenly to obtain a base liquid;

[0020] Add an antioxidant to the base liquid, heat it to a fourth temperature, mix it evenly, then heat it to a fifth temperature, add a friction reducer, mix it evenly; cool it to a sixth temperature, add a preservative, mix it evenly; finally, cool it to room temperature, add an anti-swelling agent, mix it evenly, and filter it to obtain an EPDM rubber cup lubricant.

[0021] In some embodiments, the first temperature is 40°C ± 5°C;

[0022] The second temperature is 50°C ± 5°C;

[0023] The third temperature is 40°C±5°C.

[0024] In some embodiments, the fourth temperature is 40°C ± 5°C;

[0025] The fifth temperature is 60°C ± 5°C;

[0026] The sixth temperature is 40°C±5°C.

[0027] In some embodiments, mixing at the second temperature for 20 to 30 minutes;

[0028] At the third temperature, mixing for 10 to 15 minutes;

[0029] At the fourth temperature, mix for 15 to 20 minutes;

[0030] At the fifth temperature, mix for 25 to 35 minutes;

[0031] At the sixth temperature, mix for 15 to 20 minutes;

[0032] After adding the anti-swelling agent, mix for 20 to 40 minutes.

[0033] The beneficial effects of the technical solution provided by this application include:

[0034] The embodiment of the present application provides an EPDM rubber cup lubricant and a preparation method thereof. The lubricant provided in the embodiment of the present application has a base oil including polyethylene glycol, triethylene glycol monomethyl ether borate and a low molecular weight polyether, and has good low temperature fluidity after compounding, and its kinematic viscosity at -40°C is less than 1000mm 2 / s. It has excellent compatibility with EPDM rubber in brake fluid, with a volume increase of less than 1%, which is similar to brake fluid; it has good friction reduction performance, with a friction coefficient of less than 0.13, which is equivalent to grease; the hydrogen ion concentration index PH value is 7-7.2, which is neutral and will not corrode human skin. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 This is a flow chart of the method for preparing an EPDM rubber cup lubricant provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0038] The embodiment of the present application provides an EPDM rubber cup lubricant, which can solve the problem in the related art that brake fluid as a lubricating medium will corrode the skin of assembly operators, and grease will cause the EPDM rubber cup to swell in volume by 8%-12%.

[0039] Specifically, an EPDM rubber cup lubricant provided in an embodiment of the present application includes, calculated by mass percentage, 65-80% of polyethylene glycol; 10-25% of triethylene glycol monomethyl ether borate; 5% to 10% of low molecular weight polyether; 2.5-5% of friction reducer; 1-3% of antioxidant; 0.1-0.3% of preservative; and 0.5-4% of anti-swelling agent.

[0040] The lubricant provided in the embodiment of the present application has a base oil including polyethylene glycol, triethylene glycol monomethyl ether borate and a low molecular weight polyether, and has good low temperature fluidity after compounding, and its kinematic viscosity at -40°C is less than 1000mm 2 / s. It has excellent compatibility with EPDM rubber in brake fluid, with a volume increase of less than 1%, which is similar to brake fluid; it has good friction reduction performance, with a friction coefficient of less than 0.13, which is equivalent to grease; the hydrogen ion concentration index PH value is 7-7.2, which is neutral and will not corrode human skin.

[0041] The low molecular weight polyether includes one or more of propylene glycol block polyether and diethylene glycol monobutyl ether, and the average molecular weight of the propylene glycol block polyether is lower than 1300.

[0042] The friction reducer includes one or more of triethanolamine oleic acid soap and dioctyl alkaline zinc salt of sulfur and phosphorus, and the friction coefficient of the friction reducer is less than 0.13N / m 2 .

[0043] The antioxidant comprises one or more of diisopropanolamine and 2,6-di-tert-butyl-p-cresol. The antioxidant performance of the antioxidant is 70°C±2°C, 168h±2h, no visible pitting, pitting and colloid precipitation, and the weight change of the cast iron sheet is less than ±0.1mg / cm 2 ; The weight change of aluminum sheet is less than ±0.03mg / cm 2 .

[0044] The preservative includes one or more of methyl benzotriazole, benzotriazole and ammonium benzoate. The anti-corrosion performance of the preservative is that under the conditions of 100°C±2°C and 120h±2h, there is no visible discoloration, pitting and surface roughness; the weight change of tinplate is less than ±0.05mg / cm 2 ; Steel sheet weight change is less than ±0.05mg / cm 2 ; Cast iron sheet weight change is less than ±0.05mg / cm 2 ; The weight change of aluminum sheet is less than ±0.02mg / cm 2 ; Brass sheet weight change is less than ±0.02mg / cm 2 ; The weight change of copper sheet is less than ±0.02mg / cm 2 ; Zinc sheet weight change is less than ±0.02mg / cm 2 .

[0045] The anti-swelling agent includes one or more of 2-hydroxysuccinic acid and DL-2-aminosuccinic acid, and the volume increase value of the brake fluid rubber adaptability (for EPDM rubber) of the anti-swelling agent is less than 1%.

[0046] See also Figure 1 As shown, the present application embodiment also provides a method for preparing the EPDM rubber cup lubricant, which comprises the following steps:

[0047] 101: After the polyethylene glycol is heated to a first temperature, triethylene glycol monomethyl ether borate is added, and the temperature is raised to a second temperature, and mixed for 20 to 30 minutes to mix evenly; after cooling to a third temperature, a low molecular weight polyether is added, and mixed for 10 to 15 minutes to mix evenly to obtain a base liquid.

[0048] The first temperature can be 40°C ± 5°C, that is, polyethylene glycol is heated to 40°C ± 5°C, and the best effect is achieved at this temperature. The second temperature can be 50°C ± 5°C, that is, triethylene glycol monomethyl ether borate is added and then heated to 50°C ± 5°C for mixing, which can fully dissolve it and obtain better low-temperature fluidity. The third temperature can be 40°C ± 5°C, that is, adding low molecular weight polyether at 40°C ± 5°C can obtain better anti-rust performance.

[0049] 102: Add an antioxidant to the base liquid, heat it to the fourth temperature, mix it for 15 to 20 minutes, mix it evenly, then heat it to the fifth temperature, add a friction reducer, mix it for 25 to 35 minutes, mix it evenly; cool it to the sixth temperature, add a preservative, mix it for 15 to 20 minutes, mix it evenly; finally, cool it to room temperature, add an anti-swelling agent, mix it for 20 to 40 minutes, mix it evenly, and filter it to obtain an EPDM rubber cup lubricant.

[0050] The fourth temperature may be 40°C±5°C, that is, the base liquid is first heated to 40°C±5°C, at which the best effect is achieved. The fifth temperature may be 60°C±5°C, and the sixth temperature may be 40°C±5°C.

[0051] The blending reaction temperatures of different additives are different. Antioxidants and preservatives can fully dissolve and react at a temperature of 40℃±5℃, and friction reducers can fully dissolve and react at a temperature of 60℃±5℃. Adding them in stages allows the base fluid and additives to fully react and blend, which effectively improves the brake fluid rubber adaptability and lubricity of the EPDM rubber cup lubricant, and makes the antioxidant and anti-corrosion properties more stable.

[0052] Example 1

[0053] An EPDM rubber cup lubricant, the raw material composition and mass percentage content of which are: 5% friction reducer; 1.5% antioxidant; 0.25% preservative; 2.5% anti-swelling agent, and the rest is base liquid, wherein the base liquid includes 70% polyethylene glycol; 12% triethylene glycol monomethyl ether borate; 8.75% low molecular weight polyether. The low molecular weight polyether is propylene glycol block polyether, the friction reducer is triethanolamine oleic acid soap, and the friction coefficient is less than 0.13N / m 2The antioxidant is diisopropanolamine, and its antioxidant performance is 70℃±2℃, 168h±2h conditions, no visible pitting, pitting and colloid precipitation, cast iron sheet weight change is less than ±0.1mg / cm 2 ; The weight change of aluminum sheet is less than ±0.03mg / cm 2 The preservative is methyl benzotriazole, and its anti-corrosion performance is that under the conditions of 100℃±2℃, 120h±2h, there is no visible discoloration, pitting and surface roughness; the weight change of tinplate is less than ±0.05mg / cm 2 ; Steel sheet weight change is less than ±0.05mg / cm 2 ; Cast iron sheet weight change is less than ±0.05mg / cm 2 ; The weight change of aluminum sheet is less than ±0.02mg / cm 2 ; Brass sheet weight change is less than ±0.02mg / cm 2 ; The weight change of copper sheet is less than ±0.02mg / cm 2 ; Zinc sheet weight change is less than ±0.02mg / cm 2 The anti-swelling agent is 2-hydroxysuccinic acid, and the volume increase value of the brake fluid rubber adaptability (ethylene propylene diene monomer rubber) is less than 1%.

[0054] A method for preparing an EPDM rubber cup lubricant comprises the following steps in sequence:

[0055] Preparation of base liquid: Heat polyethylene glycol to 40℃±5℃ in proportion, add triethylene glycol monomethyl ether borate, heat to 50℃±5℃ and mix for 30min, then cool to room temperature of 40℃±5℃, add low molecular weight polyether and mix for 15min to obtain base liquid.

[0056] Preparation of EPDM rubber cup lubricant: first add antioxidant to the base liquid in the required proportion, mix at 40℃±5℃ for 20 minutes; heat to 60℃±5℃, add friction reducer and mix for 35 minutes; cool to 40℃±5℃, add preservative and mix for 20 minutes; cool to room temperature, add anti-swelling agent and mix for 40 minutes, filter to obtain EPDM rubber cup lubricant.

[0057] Example 2

[0058] An EPDM rubber cup lubricant, the raw material composition and mass percentage content of which are: 4% friction reducer; 2.3% antioxidant; 0.1% preservative; 2.6% anti-swelling agent, and the rest is base liquid, wherein the base liquid includes 75% polyethylene glycol; 10% triethylene glycol monomethyl ether borate; 6% low molecular weight polyether. The low molecular weight polyether is propylene glycol block polyether, the friction reducer is triethanolamine oleic acid soap, and the friction coefficient is less than 0.13N / m2 The antioxidant is diisopropanolamine, and its antioxidant performance is 70℃±2℃, 168h±2h conditions, no visible pitting, pitting and colloid precipitation, cast iron sheet weight change is less than ±0.1mg / cm 2 ; The weight change of aluminum sheet is less than ±0.03mg / cm 2 The preservative is methyl benzotriazole, and its anti-corrosion performance is that under the conditions of 100℃±2℃, 120h±2h, there is no visible discoloration, pitting and surface roughness; the weight change of tinplate is less than ±0.05mg / cm 2 ; Steel sheet weight change is less than ±0.05mg / cm 2 ; Cast iron sheet weight change is less than ±0.05mg / cm 2 ; The weight change of aluminum sheet is less than ±0.02mg / cm 2 ; Brass sheet weight change is less than ±0.02mg / cm 2 ; The weight change of copper sheet is less than ±0.02mg / cm 2 ; Zinc sheet weight change is less than ±0.02mg / cm 2 The anti-swelling agent is 2-hydroxysuccinic acid, and the volume increase value of the brake fluid rubber adaptability (ethylene propylene diene monomer rubber) is less than 1%.

[0059] A method for preparing an EPDM rubber cup lubricant comprises the following steps in sequence:

[0060] Preparation of base liquid: Heat polyethylene glycol to 40℃±5℃ in proportion, add triethylene glycol monomethyl ether borate, heat to 50℃±5℃ and mix for 30min, then cool to room temperature of 40℃±5℃, add low molecular weight polyether and mix for 15min to obtain base liquid.

[0061] Preparation of EPDM rubber cup lubricant: first add antioxidant to the base liquid in the required proportion, mix at 40℃±5℃ for 20 minutes; heat to 60℃±5℃, add friction reducer and mix for 35 minutes; cool to 40℃±5℃, add preservative and mix for 20 minutes; cool to room temperature, add anti-swelling agent and mix for 40 minutes, filter to obtain EPDM rubber cup lubricant.

[0062] Example 3

[0063] An EPDM rubber cup lubricant, the raw material composition and mass percentage content of which are: 3.5% friction reducer; 2.5% antioxidant; 0.1% preservative; 2.9% anti-swelling agent, and the rest is base liquid, wherein the base liquid includes 65% polyethylene glycol; 20% triethylene glycol monomethyl ether borate; 6% low molecular weight polyether. The low molecular weight polyether is diethylene glycol monobutyl ether, the friction reducer is triethanolamine oleic acid soap, and the friction coefficient is less than 0.13N / m 2 The antioxidant is diisopropanolamine, and its antioxidant performance is 70℃±2℃, 168h±2h conditions, no visible pitting, pitting and colloid precipitation, cast iron sheet weight change is less than ±0.1mg / cm 2 ; The weight change of aluminum sheet is less than ±0.03mg / cm 2 The preservative is methyl benzotriazole, and its anti-corrosion performance is that under the conditions of 100℃±2℃, 120h±2h, there is no visible discoloration, pitting and surface roughness; the weight change of tinplate is less than ±0.05mg / cm 2 ; Steel sheet weight change is less than ±0.05mg / cm 2 ; Cast iron sheet weight change is less than ±0.05mg / cm 2 ; The weight change of aluminum sheet is less than ±0.02mg / cm 2 ; Brass sheet weight change is less than ±0.02mg / cm 2 ; The weight change of copper sheet is less than ±0.02mg / cm 2 ; Zinc sheet weight change is less than ±0.02mg / cm 2 The anti-swelling agent is 2-hydroxysuccinic acid, and the volume increase value of the brake fluid rubber adaptability (ethylene propylene diene monomer rubber) is less than 1%.

[0064] A method for preparing an EPDM rubber cup lubricant comprises the following steps in sequence:

[0065] Preparation of base liquid: Heat polyethylene glycol to 40℃±5℃ in proportion, add triethylene glycol monomethyl ether borate, heat to 50℃±5℃ and mix for 30min, then cool to room temperature of 40℃±5℃, add low molecular weight polyether and mix for 15min to obtain base liquid.

[0066] Preparation of EPDM rubber cup lubricant: first add antioxidant to the base liquid in the required proportion, mix at 40℃±5℃ for 20 minutes; heat to 60℃±5℃, add friction reducer and mix for 35 minutes; cool to 40℃±5℃, add preservative and mix for 20 minutes; cool to room temperature, add anti-swelling agent and mix for 40 minutes, filter to obtain EPDM rubber cup lubricant.

[0067] In order to examine the performance of this application, the physical and chemical properties of the EPDM rubber cup lubricant prepared in the above Example 1 were tested as follows, and the results are shown in Table 1:

[0068] Table 1

[0069]

[0070]

[0071] By comparing the data in Table 1, it can be clearly shown that the blending formula used in this application has the following advantages in terms of rubber compatibility, lubricity, oxidation resistance, corrosion resistance, low-temperature fluidity and other performances:

[0072] 1. EPDM rubber cups can play a role in pressure transmission and sealing in the clutch pump and brake pump of the vehicle, so there are strict requirements for the dimensional accuracy of the cups and the master pump. In actual applications, the volume increase of the cups cannot be greater than 4%. The brake fluid rubber compatibility of the blended EPDM rubber cup lubricant has a volume increase of less than 1%. It is far better than silicone grease and equivalent to DOT3 brake fluid.

[0073] 2. When assembling the clutch pump and brake pump cups, the outer diameter of the cups and the inner diameter of the pumps are interference fits, and direct installation will scratch the cups. Therefore, the assembly surface needs to be lubricated. EPDM rubber cup lubricant has good lubricity and sliding resistance, and its friction coefficient is less than 0.13N / m 2 , much lower than DOT3 brake fluid and slightly better than silicone grease.

[0074] 3. The blended EPDM rubber cup lubricant has better antioxidant and anti-corrosion properties, and the weight loss of its metal test piece is better than that of silicone grease and DOT3 brake fluid.

[0075] 4. The low-temperature fluidity of the blended EPDM rubber cup lubricant is good, and the kinematic viscosity at -40℃ is less than 1000mm 2 / s, both are superior to silicone grease and DOT3 brake fluid.

[0076] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0077] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0078] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An EPDM rubber cup lubricant, characterized in that: Calculated in terms of mass percentage, it includes: 65-80% polyethylene glycol; 10-25% triethylene glycol monomethyl ether borate; 5% to 10% low molecular weight polyether; 2.5-5% friction reducer; 1-3% antioxidant; 0.1-0.3% preservative; 0.5-4% anti-swelling agent; The low molecular weight polyether includes one or more of propylene glycol block polyether and diethylene glycol monobutyl ether, and the average molecular weight of the propylene glycol block polyether is lower than 1300; The friction reducer includes one or more of triethanolamine oleic acid soap and dioctyl alkaline zinc salt of thiophosphate; The friction coefficient of the friction reducer is less than 0.13N / m 2 ; The antioxidant includes one or more of diisopropanolamine and 2,6-di-tert-butyl-p-cresol; The antioxidant performance of the antioxidant is that under the conditions of 70℃±2℃, 168h±2h, there is no visible pitting, pitting and colloid precipitation, and the weight change of the cast iron sheet is less than ±0.1mg / cm 2 ; The weight change of aluminum sheet is less than ±0.03 mg / cm 2 ; The preservative includes one or more of methyl benzotriazole, benzotriazole and ammonium benzoate; The anti-corrosion performance of the preservative is that under the conditions of 100℃±2℃, 120h±2h, there is no visible discoloration, pitting and surface roughness; the weight change of tinplate is less than ±0.05mg / cm 2 ; Steel sheet weight change is less than ±0.05 mg / cm 2 ; Cast iron sheet weight change is less than ±0.05 mg / cm 2 ; The weight change of aluminum sheet is less than ±0.02 mg / cm 2 ; Brass sheet weight change is less than ±0.02mg / cm 2 ; The weight change of copper sheet is less than ±0.02 mg / cm 2 ; Zinc sheet weight change is less than ±0.02mg / cm 2 ; The anti-swelling agent includes one or more of 2-hydroxysuccinic acid and DL-2-aminosuccinic acid; The volume increase value of the anti-swelling agent for the rubber adaptability of the EPDM brake fluid is less than 1%; The pH value of the EPDM rubber cup lubricant is 7-7.2, and when used as a lubricating medium of the EPDM rubber cup, the volume increase of the EPDM rubber cup is less than 1%.

2. The method for preparing the EPDM rubber cup lubricant according to claim 1, characterized in that: It includes the following steps: After the polyethylene glycol is heated to a first temperature, triethylene glycol monomethyl ether borate is added, and the temperature is raised to a second temperature and mixed evenly; after cooling to a third temperature, a low molecular weight polyether is added and mixed evenly to obtain a base liquid; Add an antioxidant to the base liquid, heat it to a fourth temperature, mix it evenly, then heat it to a fifth temperature, add a friction reducer, mix it evenly; cool it to a sixth temperature, add a preservative, mix it evenly; finally, cool it to room temperature, add an anti-swelling agent, mix it evenly, and filter it to obtain an EPDM rubber cup lubricant.

3. The method for preparing the EPDM rubber cup lubricant according to claim 2, characterized in that: The first temperature is 40°C ± 5°C; The second temperature is 50°C ± 5°C; The third temperature is 40°C±5°C.

4. The method for preparing the EPDM rubber cup lubricant according to claim 2, characterized in that: The fourth temperature is 40°C ± 5°C; The fifth temperature is 60°C ± 5°C; The sixth temperature is 40°C±5°C.

5. The method for preparing the EPDM rubber cup lubricant according to claim 2, characterized in that: At the second temperature, mix for 20-30 minutes; At the third temperature, mix for 10-15 minutes; At the fourth temperature, mix for 15-20 minutes; At the fifth temperature, mix for 25-35 minutes; At the sixth temperature, mix for 15-20 minutes; After adding the anti-swelling agent, mix for 20 to 40 minutes.

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