High-temperature-resistant rubber emulsion as well as preparation method and application thereof

Abstract

The invention relates to the technical field of rubber preparation, and discloses a high-temperature-resistant rubber emulsion as well as a preparation method and application thereof, and the high-temperature-resistant rubber emulsion comprises the following raw materials in parts by weight: 100-200 parts of hydrogenated butadiene-acrylonitrile rubber; 2-5 parts of a compound heat-resistant agent; 15 to 31 parts of a nano material modified polymer; 24-5 parts of a reinforcing agent; 5-12 parts of an accelerant and 6-15 parts of a plasticizer; 1.2 to 2.5 parts of a vulcanizing agent; 1.5-3 parts of an assistant cross-linking agent; the compound heat-resistant agent is prepared by compounding methyl phenyl dimethoxy silane, cerium oxide and titanium dioxide. The high-temperature-resistant rubber emulsion has good oil resistance and good resistance to fuel oil, lubricating oil and aromatic solvents.

Description

Technical Field

[0001] The invention relates to the technical field of rubber preparation, and more specifically to a high temperature resistant rubber emulsion and a preparation method and application thereof. Background Art

[0002] Hydrogenated nitrile rubber (HNBR) is a special rubber product made by selective catalytic hydrogenation of double bonds on the nitrile rubber molecular chain. It has excellent heat resistance and oil resistance. Due to its unique molecular structure, it has high chemical stability and thermal stability. It is widely used in aerospace, automotive industry, oil field exploration and other fields with extremely harsh use conditions. However, unreinforced rubber has no practical value and must be combined with a reinforcement system to play its role. Unsaturated carboxylic acid metal salts, as a unique reinforcement system in the rubber field, can self-polymerize to form nano-scale dispersions that are evenly mixed inside the rubber matrix, significantly improving the mechanical properties of the elastomer. However, most unsaturated carboxylic acids are corrosive and have pungent odors, and the processing process is cumbersome. The hardness of the prepared vulcanized rubber is too high. Although the reinforcement effect is significant, it greatly limits its application.

[0003] With the increasing requirements of modern industry for the high temperature resistance of silicone rubber, especially in the fields of sealing rings and automotive hoses, silicone rubber is required to withstand temperatures of 280°C or even higher and still maintain good mechanical properties under this condition.

[0004] High temperature resistant rubber emulsions used in aerospace equipment need to have excellent high temperature resistance and stability. High temperature resistant rubber emulsions used in aerospace equipment have some disadvantages, mainly including the following aspects: Many high temperature resistant rubber materials, such as silicone rubber and fluororubber, have excellent heat resistance, but their tensile strength and tear strength are usually low. The wear resistance is usually not as good as other types of rubber, which means that they may wear out during long-term use, thus affecting the sealing performance and service life. Summary of the invention

[0005] The present invention provides a high temperature resistant rubber emulsion and a preparation method and application thereof. The high temperature resistant rubber emulsion has good oil resistance and good resistance to fuel oil, lubricating oil and aromatic solvents. Due to its highly saturated structure, it has good heat resistance and high strength, and is widely used in aerospace, automobile industry, oil drilling, machinery manufacturing, textile printing and other industries.

[0006] In a first aspect, the present invention provides a high temperature resistant rubber latex, comprising the following raw materials in parts by weight: 100-200 parts of hydrogenated nitrile rubber; 2-5 parts of a compounded heat-resistant agent; 15-31 parts of a nanomaterial modified polymer; 24-45 parts of a reinforcing agent; 5-12 parts of an accelerator, 6-15 parts of a plasticizer; 1.2-2.5 parts of a vulcanizing agent; and 1.5-3 parts of a co-crosslinking agent; the compounded heat-resistant agent is prepared by compounding methylphenyldimethoxysilane, cerium oxide and titanium dioxide.

[0007] Preferably, the raw materials include the following parts by weight: 100 parts of hydrogenated nitrile rubber; 3-5 parts of compounded heat-resistant agent; 25-31 parts of nano-material modified polymer; 24-38 parts of reinforcing agent; 8-12 parts of accelerator, 8-12 parts of plasticizer; 1.5-2.1 parts of vulcanizer; and 1.8-2.5 parts of co-crosslinking agent.

[0008] Preferably, the raw materials include the following parts by weight: 100 parts of hydrogenated nitrile rubber; 5 parts of compounded heat-resistant agent; 28 parts of nanomaterial modified polymer; 30 parts of reinforcing agent; 10 parts of accelerator, 8 parts of plasticizer; 1.8 parts of vulcanizer; and 2.1 parts of co-crosslinking agent.

[0009] Preferably, the mass ratio of methylphenyldimethoxysilane, cerium oxide and titanium dioxide is (1-5): (1-3): (1-2).

[0010] Preferably, the nanomaterial-modified polymer comprises the following raw materials in parts by weight: 5-10 parts of nano-silicon dioxide, 2-8 parts of graphene oxide and 21-35 parts of vinyl acetate / ethylene copolymer.

[0011] Preferably, the method for preparing a nanomaterial-modified polymer comprises the following steps: S1: weighing nano-silicon dioxide and graphene oxide, mixing, and preparing a mixture; S2: Add vinyl triethoxysilane to the mixture, stir for 20-30 minutes, and ultrasonically disperse for 15-20 minutes to obtain a mixed solution; S3: adding vinyl acetate / ethylene copolymer to the mixed solution of step S2, stirring, and copolymerizing to obtain a nanomaterial modified polymer.

[0012] Preferably, the hydrogenated nitrile rubber comprises the following raw materials in parts by weight: 15-25 parts of butadiene, 15-25 parts of acrylonitrile, 1-5 parts of methacrylic acid, 5-10 parts of tert-dodecyl mercaptan, 1-3 parts of sodium dodecylbenzene sulfonate, 0.1-1 parts of potassium persulfate, and 50-60 parts of pure water.

[0013] Preferably, the preparation method of hydrogenated nitrile rubber comprises the following steps: B1: Weigh butadiene, acrylonitrile and potassium persulfate, add softened water and stir to fully dissolve to prepare solution A; B2: Weigh methacrylic acid and tert-dodecyl mercaptan, add softened water to dissolve, and then add sodium dodecylbenzene sulfonate to prepare solution H; B3: Solution A prepared in B1 and solution H prepared in B2 are mixed, stirred at 240-3000 rpm and 36-38° C., and after polymerization, hydrogenated nitrile rubber is obtained.

[0014] Preferably, the reinforcing agent is one or more of zinc sorbate / carbon black nanocomposite filler, microcrystalline graphite, white carbon black, iron red, chopped carbon fiber, zinc sorbate, and basalt fiber.

[0015] Preferably, the accelerator is benzyltriphenylphosphine chloride; the vulcanizing agent is one or more of the vulcanizing agent bis 25, a single component platinum vulcanizing agent, and bisphenol AF (2,2-bis-(4-hydroxyphenyl)hexafluoropropane).

[0016] Preferably, the plasticizer is one or more of dibutyl phthalate, dioctyl phthalate, diisobutyl phthalate, tricresyl phosphate and dinonyl phthalate.

[0017] Preferably, the auxiliary crosslinking agent is one or more of triallyl isocyanurate, HVA-2, PL-400, dicumyl peroxide, di-tert-butyl peroxide and multifunctional polycarbodiimide auxiliary crosslinking agents.

[0018] In a second aspect, the present invention provides a method for preparing a high temperature resistant rubber emulsion, comprising the following steps: (1) Pressurizing and kneading the hydrogenated nitrile rubber, the compound heat-resistant agent and the nanomaterial-modified polymer at a pressure of 0.45 MPa; (2) Add reinforcing agent, co-crosslinking agent and plasticizer, mix at 0.25MPa, keep the pressure unchanged, raise the temperature to 80-90℃, add vulcanizer and accelerator, raise the temperature to 150℃, mix, and vulcanize at 180℃ and pressure of 10-12MPa for 20-40min, and then vulcanize at 150-180℃ for 2-3h.

[0019] In a third aspect, the present invention provides a high temperature resistant rubber latex for use in aerospace equipment.

[0020] In summary, the present invention has the following beneficial effects: 1. In the present invention, methylphenyldimethoxysilane is added to cerium oxide and titanium dioxide to prepare a heat-resistant agent, and a secondary vulcanization treatment is performed to improve the heat resistance of the high-temperature resistant rubber; 2. The nanomaterials in the present invention have the characteristics of small size, large specific surface area, strong surface effect and many active sites (groups). Mixing nanomaterials with polymers to form physical composites or grafting nanomaterials onto polymer macromolecular chains for chemical modification has also become an important means to improve the various solutions and application properties of polymers and their composite systems. The physical or chemical interaction between polymers and nanomaterials can significantly improve the temperature and salt resistance, rheological properties and oil-water interface properties of polymers or composite systems. 3. The high temperature resistant rubber emulsion prepared by the present invention has good oil resistance and good resistance to fuel oil, lubricating oil and aromatic solvents. Due to its highly saturated structure, it has good heat resistance and high strength, and is widely used in aerospace, automobile industry, oil drilling, machinery manufacturing, textile printing and other industries.

[0021] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not intended to limit the scope of protection of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a semi-finished product of the high temperature resistant rubber latex obtained in an embodiment of the present invention; Figure 2 This is a finished product picture of the high temperature resistant rubber latex prepared in the embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the examples. It is particularly noted that if no specific conditions are specified in the following examples, the reactions are carried out according to conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following examples can be obtained from common commercial sources. Preparation Example Preparation Example 1

[0024] The nano material modified polymer comprises the following raw materials in parts by weight: 5 parts of nano silicon dioxide, 2 parts of graphene oxide and 21 parts of vinyl acetate / ethylene copolymer.

[0025] The preparation method of nano material modified polymer comprises the following steps: S1: weighing nano-silicon dioxide and graphene oxide, mixing, and preparing a mixture; S2: Add vinyl triethoxysilane to the mixture, stir for 20 minutes, and ultrasonically disperse for 15 minutes to obtain a mixed solution; S3: adding vinyl acetate / ethylene copolymer to the mixed solution of step S2, stirring, and copolymerizing to obtain a nanomaterial modified polymer. Preparation Example 2

[0026] The nano material modified polymer comprises the following raw materials in parts by weight: 8 parts of nano silicon dioxide, 5 parts of graphene oxide and 25 parts of vinyl acetate / ethylene copolymer.

[0027] The preparation method of nano material modified polymer comprises the following steps: S1: weighing nano-silicon dioxide and graphene oxide, mixing, and preparing a mixture; S2: Add vinyl triethoxysilane to the mixture, stir for 20 minutes, and ultrasonically disperse for 15 minutes to obtain a mixed solution; S3: adding vinyl acetate / ethylene copolymer to the mixed solution of step S2, stirring, and copolymerizing to obtain a nanomaterial modified polymer. Preparation Example 3

[0028] The nano material modified polymer comprises the following raw materials in parts by weight: 10 parts of nano silicon dioxide, 8 parts of graphene oxide and 35 parts of vinyl acetate / ethylene copolymer.

[0029] The preparation method of nano material modified polymer comprises the following steps: S1: weighing nano-silicon dioxide and graphene oxide, mixing them to prepare a mixture; S2: Add vinyl triethoxysilane to the mixture, stir for 30 minutes, and ultrasonically disperse for 20 minutes to obtain a mixed solution; S3: adding vinyl acetate / ethylene copolymer to the mixed solution of step S2, stirring, and copolymerizing to obtain a nanomaterial modified polymer. Preparation Example 4

[0030] The hydrogenated nitrile rubber comprises the following raw materials in parts by weight: 15 parts of butadiene, 15 parts of acrylonitrile, 1 part of methacrylic acid, 5 parts of tert-dodecyl mercaptan, 1 part of sodium dodecylbenzene sulfonate, 0.1 part of potassium persulfate and 50 parts of pure water.

[0031] The preparation method of hydrogenated nitrile rubber comprises the following steps: B1: Weigh butadiene, acrylonitrile and potassium persulfate, add softened water and stir to fully dissolve to prepare solution A; B2: Weigh methacrylic acid and tert-dodecyl mercaptan, add demineralized water to dissolve, and prepare solution H; B3: Solution A prepared in B1 and solution H prepared in B2 were mixed, stirred at 240 rpm and 38° C., and after polymerization, hydrogenated nitrile rubber was obtained. Preparation Example 5

[0032] The hydrogenated nitrile rubber comprises the following raw materials in parts by weight: 20 parts of butadiene, 18 parts of acrylonitrile, 3 parts of methacrylic acid, 8 parts of tert-dodecyl mercaptan, 2 parts of sodium dodecylbenzene sulfonate, 0.5 parts of potassium persulfate and 55 parts of pure water.

[0033] The preparation method of hydrogenated nitrile rubber comprises the following steps: B1: Weigh butadiene, acrylonitrile and potassium persulfate, add softened water and stir to fully dissolve to prepare solution A; B2: Weigh methacrylic acid and tert-dodecyl mercaptan, add demineralized water to dissolve, and prepare solution H; B3: Solution A prepared in B1 and solution H prepared in B2 were mixed, stirred at 240 rpm and 38° C., and after polymerization, hydrogenated nitrile rubber was obtained. Preparation Example 6

[0034] The hydrogenated nitrile rubber comprises the following raw materials in parts by weight: 25 parts of butadiene, 25 parts of acrylonitrile, 5 parts of methacrylic acid, 10 parts of tert-dodecyl mercaptan, 3 parts of sodium dodecylbenzene sulfonate, 1 part of potassium persulfate and 60 parts of pure water.

[0035] The preparation method of hydrogenated nitrile rubber comprises the following steps: B1: Weigh butadiene, acrylonitrile and potassium persulfate, add softened water and stir to fully dissolve to prepare solution A; B2: Weigh methacrylic acid and tert-dodecyl mercaptan, add demineralized water to dissolve, and prepare solution H; B3: Solution A prepared in B1 and solution H prepared in B2 were mixed, stirred at 240 rpm and 38° C., and after polymerization, hydrogenated nitrile rubber was obtained. Example Example 1

[0036] A high temperature resistant rubber latex, comprising the following raw materials in parts by weight: 100 parts of hydrogenated nitrile rubber; 2 parts of compound heat resistant agent; 15 parts of nano material modified polymer; 24 parts of reinforcing agent; 5 parts of accelerator, 6 parts of plasticizer; 1.2 parts of vulcanizer; 1.5 parts of cross-linking agent; The compound heat-resistant agent is prepared by compounding methylphenyldimethoxysilane, cerium oxide and titanium dioxide in a mass ratio of 1:2:1; The nanomaterial modified polymer is prepared in Preparation Example 1; the hydrogenated nitrile rubber is prepared in Preparation Example 4; The reinforcing agent is zinc sorbate / carbon black nanocomposite filler; the accelerator is benzyl triphenyl phosphine chloride; The curing agent is bisphenol AF (2,2-bis-(4-hydroxyphenyl)hexafluoropropane); The auxiliary cross-linking agent is triallyl isocyanurate.

[0037] High temperature resistant rubber latex is made by the following steps: The hydrogenated nitrile rubber, compound heat-resistant agent and nanomaterial modified polymer were pressurized and kneaded at a pressure of 0.45 MPa for 5 minutes, and a reinforcing agent, a co-crosslinking agent and a plasticizer were added. The mixture was kneaded at 0.25 MPa for 15 minutes, and the pressure was kept constant. The temperature was raised to 90°C, and a vulcanizing agent and an accelerator were added. The temperature was raised to 150°C, and the mixture was mixed for 20 minutes. The mixture was vulcanized at a temperature of 180°C and a pressure of 10 MPa for 20 minutes, and then vulcanized at a temperature of 150°C for 3 hours. Example 2

[0038] A high temperature resistant rubber latex, comprising the following raw materials in parts by weight: 150 parts of hydrogenated nitrile rubber; 4 parts of compounded heat resistant agent; 18 parts of nano material modified polymer; 28 parts of reinforcing agent; 8 parts of accelerator, 9 parts of plasticizer; 1.8 parts of vulcanizer; 2.1 parts of auxiliary cross-linking agent; The compound heat-resistant agent is prepared by compounding methylphenyldimethoxysilane, cerium oxide and titanium dioxide in a mass ratio of 3:1:1; The nanomaterial modified polymer is prepared in Preparation Example 2; the hydrogenated nitrile rubber is prepared in Preparation Example 5; The reinforcing agent is microcrystalline graphite; the accelerator is benzyltriphenylphosphine chloride; The curing agent is bisphenol AF (2,2-bis-(4-hydroxyphenyl)hexafluoropropane); The auxiliary crosslinking agent is di-tert-butyl peroxide.

[0039] High temperature resistant rubber latex is made by the following steps: The hydrogenated nitrile rubber, compound heat-resistant agent and nanomaterial modified polymer were pressurized and kneaded at a pressure of 0.45 MPa for 5 minutes, and a reinforcing agent, a co-crosslinking agent and a plasticizer were added. The mixture was kneaded at 0.25 MPa for 15 minutes, and the pressure was kept constant. The temperature was raised to 90°C, and a vulcanizing agent and an accelerator were added. The temperature was raised to 150°C, and the mixture was mixed for 20 minutes. The mixture was vulcanized at a temperature of 180°C and a pressure of 10 MPa for 20 minutes, and then vulcanized at a temperature of 150°C for 3 hours. Example 3

[0040] A high temperature resistant rubber latex comprises the following raw materials in parts by weight: 180 parts of hydrogenated nitrile rubber; 3 parts of compounded heat resistant agent; 20 parts of nano material modified polymer; 35 parts of reinforcing agent; 10 parts of accelerator, 10 parts of plasticizer; 2.0 parts of vulcanizer; 2 parts of cross-linking agent; The compound heat-resistant agent is prepared by compounding methylphenyldimethoxysilane, cerium oxide and titanium dioxide in a mass ratio of 2:1:1; The nanomaterial modified polymer is prepared in Preparation Example 2; the hydrogenated nitrile rubber is prepared in Preparation Example 5; The reinforcing agent is zinc sorbate / carbon black nanocomposite filler; the accelerator is benzyl triphenyl phosphine chloride; The curing agent is bisphenol AF (2,2-bis-(4-hydroxyphenyl)hexafluoropropane); The auxiliary cross-linking agent is triallyl isocyanurate.

[0041] High temperature resistant rubber latex is made by the following steps: The hydrogenated nitrile rubber, compound heat-resistant agent and nanomaterial modified polymer were pressurized and kneaded at a pressure of 0.45 MPa for 5 minutes, and a reinforcing agent, a co-crosslinking agent and a plasticizer were added. The mixture was kneaded at 0.25 MPa for 15 minutes, and the pressure was kept constant. The temperature was raised to 90°C, and a vulcanizing agent and an accelerator were added. The temperature was raised to 150°C, and the mixture was mixed for 20 minutes. The mixture was vulcanized at a temperature of 180°C and a pressure of 10 MPa for 20 minutes, and then vulcanized at a temperature of 150°C for 3 hours. Example 4

[0042] A high temperature resistant rubber latex comprises the following raw materials in parts by weight: 150 parts of hydrogenated nitrile rubber; 2 parts of compounded heat resistant agent; 18 parts of nano material modified polymer; 28 parts of reinforcing agent; 8 parts of accelerator, 12 parts of plasticizer; 2.2 parts of vulcanizer; 2.5 parts of auxiliary cross-linking agent; The compound heat-resistant agent is prepared by compounding methylphenyldimethoxysilane, cerium oxide and titanium dioxide in a mass ratio of 5:3:2; The nanomaterial modified polymer is prepared in Preparation Example 3; the hydrogenated nitrile rubber is prepared in Preparation Example 6; The reinforcing agent is zinc sorbate; the accelerator is benzyltriphenylphosphine chloride; The curing agent is bisphenol AF (2,2-bis-(4-hydroxyphenyl)hexafluoropropane); The auxiliary cross-linking agent is triallyl isocyanurate.

[0043] High temperature resistant rubber latex is made by the following steps: The hydrogenated nitrile rubber, compound heat-resistant agent and nanomaterial modified polymer were pressurized and kneaded at a pressure of 0.45 MPa for 5 minutes, and a reinforcing agent, a co-crosslinking agent and a plasticizer were added. The mixture was kneaded at 0.25 MPa for 15 minutes, and the pressure was kept constant. The temperature was raised to 90°C, and a vulcanizing agent and an accelerator were added. The temperature was raised to 150°C, and the mixture was mixed for 20 minutes. The mixture was vulcanized at a temperature of 180°C and a pressure of 10 MPa for 20 minutes, and then vulcanized at a temperature of 150°C for 3 hours. Example 5

[0044] A high temperature resistant rubber latex, comprising the following raw materials in parts by weight: 200 parts of hydrogenated nitrile rubber; 5 parts of compound heat resistant agent; 31 parts of nano material modified polymer; 45 parts of reinforcing agent; 12 parts of accelerator, 15 parts of plasticizer; 2.5 parts of vulcanizer; 3 parts of auxiliary cross-linking agent; The compound heat-resistant agent is prepared by compounding methylphenyldimethoxysilane, cerium oxide and titanium dioxide in a mass ratio of 1:1:1; The nanomaterial modified polymer is prepared in Preparation Example 1; the hydrogenated nitrile rubber is prepared in Preparation Example 6; The reinforcing agent is basalt fiber; the accelerator is benzyltriphenylphosphine chloride; The curing agent is bisphenol AF (2,2-bis-(4-hydroxyphenyl)hexafluoropropane); The auxiliary cross-linking agent is triallyl isocyanurate.

[0045] High temperature resistant rubber latex is made by the following steps: The hydrogenated nitrile rubber, compound heat-resistant agent and nanomaterial modified polymer were pressurized and kneaded at a pressure of 0.45 MPa for 5 minutes, and a reinforcing agent, a co-crosslinking agent and a plasticizer were added. The mixture was kneaded at 0.25 MPa for 15 minutes, and the pressure was kept constant. The temperature was raised to 90°C, and a vulcanizing agent and an accelerator were added. The temperature was raised to 150°C, and the mixture was mixed for 20 minutes. The mixture was vulcanized at a temperature of 180°C and a pressure of 10 MPa for 20 minutes, and then vulcanized at a temperature of 150°C for 3 hours. Comparative Example 1

[0046] The preparation was carried out in the same manner as in Example 1, except that no composite heat-resistant agent was added. Comparative Example 2

[0047] The preparation was carried out in the same manner as in Example 1, except that no nanomaterial-modified polymer was added. Comparative Example 3

[0048] The preparation was carried out in the same manner as in Example 1, except that no reinforcing agent was added.

[0049] Performance Testing The high temperature resistant rubber emulsions obtained in Examples 1-5 and Comparative Examples 1-3 were tested after curing. The hardness was tested according to the standard GB / T531.1-2008, the tensile strength was tested according to the standard GB / T528-2009, the thermal conductivity was tested according to ASTM-D-5470, and the oxygen index was tested according to the standard GB / T2406.2-2009. The test results are shown in Table 1: Table 1 Test results of the high temperature resistant rubber latex obtained in Examples 1-5 and Comparative Examples 1-3 after curing

[0050] It can be seen from Table 1 that the thermal conductivity of the products obtained in Examples 1-5 is 4.4-4.8 W / (m·K) and the oxygen index is 34.5-35.1%. Compared with Comparative Examples 1-3, they not only have better mechanical strength but also have high thermal conductivity and flame retardancy.

[0051] The high temperature resistant rubber emulsion prepared by the present invention has good oil resistance and good resistance to fuel oil, lubricating oil and aromatic solvents. Due to its highly saturated structure, it has the characteristics of good heat resistance and high strength, and has great practical value when applied to aerospace equipment.

[0052] The above is only an exemplary embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A high temperature resistant rubber latex, characterized in that: The invention comprises the following raw materials in parts by weight: 100-200 parts of hydrogenated nitrile rubber; 2-5 parts of compound heat-resistant agent; 15-31 parts of nano-material modified polymer; 24-45 parts of reinforcing agent; 5-12 parts of accelerator, 6-15 parts of plasticizer; 1.2-2.5 parts of vulcanizing agent; 1.5-3 parts of auxiliary cross-linking agent; the compound heat-resistant agent is prepared by compounding methylphenyl dimethoxysilane, cerium oxide and titanium dioxide; The mass ratio of methylphenyldimethoxysilane, cerium oxide and titanium dioxide in the composite heat-resistant agent is (1-5): (1-3): (1-2); The nano material modified polymer comprises the following raw materials in parts by weight: 5-10 parts of nano silicon dioxide, 2-8 parts of graphene oxide and 21-35 parts of vinyl acetate / ethylene copolymer.

2. The high temperature resistant rubber emulsion according to claim 1, characterized in that: The preparation method of nano material modified polymer comprises the following steps: S1: weighing nano-silicon dioxide and graphene oxide, mixing, and preparing a mixture; S2: Add vinyl triethoxysilane to the mixture, stir for 20-30 minutes, and ultrasonically disperse for 15-20 minutes to obtain a mixed solution; S3: adding vinyl acetate / ethylene copolymer to the mixed solution of step S2, stirring, and copolymerizing to obtain a nanomaterial modified polymer.

3. The high temperature resistant rubber emulsion according to claim 1, characterized in that: The hydrogenated nitrile rubber comprises the following raw materials in parts by weight: 15-25 parts of butadiene, 15-25 parts of acrylonitrile, 1-5 parts of methacrylic acid, 5-10 parts of tert-dodecyl mercaptan, 1-3 parts of sodium dodecylbenzene sulfonate, 0.1-1 parts of potassium persulfate and 50-60 parts of pure water.

4. The high temperature resistant rubber emulsion according to claim 3, characterized in that: Method for preparing hydrogenated nitrile rubber, The following steps are involved: B1: Weigh butadiene, acrylonitrile and potassium persulfate, add softened water and stir to fully dissolve to prepare solution A; B2: Weigh methacrylic acid and tert-dodecyl mercaptan, add softened water to dissolve, and then add sodium dodecylbenzene sulfonate to prepare solution H; B3: Solution A prepared in B1 and solution H prepared in B2 are mixed, stirred at 240-3000 rpm and 36-38° C., and after polymerization, hydrogenated nitrile rubber is obtained.

5. The high temperature resistant rubber emulsion according to claim 1, characterized in that: The reinforcing agent is one or more of zinc sorbate / carbon black nanocomposite filler, microcrystalline graphite, white carbon black, iron red, short-cut carbon fiber, zinc sorbate and basalt fiber.

6. The high temperature resistant rubber emulsion according to claim 1, characterized in that: The accelerator is benzyltriphenylphosphine chloride; the vulcanizing agent is one or more of the vulcanizing agent bis-25, single-component platinum vulcanizing agent, and bisphenol AF (2,2-bis-(4-hydroxyphenyl)hexafluoropropane); The plasticizer is one or more of dibutyl phthalate, dioctyl phthalate, diisobutyl phthalate, tricresyl phosphate and dinonyl phthalate.

7. The high temperature resistant rubber emulsion according to claim 1, characterized in that: The auxiliary cross-linking agent is one or more of triallyl isocyanurate, HVA-2, PL-400, dicumyl peroxide, di-tert-butyl peroxide and multifunctional polycarbodiimide auxiliary cross-linking agents.

8. The method for preparing the high temperature resistant rubber emulsion according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Pressurizing and kneading the hydrogenated nitrile rubber, the compound heat-resistant agent and the nanomaterial-modified polymer at a pressure of 0.45 MPa; (2) Add reinforcing agent, co-crosslinking agent and plasticizer, mix at 0.25MPa, keep the pressure unchanged, raise the temperature to 80-90℃, add vulcanizer and accelerator, raise the temperature to 150℃, mix, and vulcanize at 180℃ and pressure of 10-12MPa for 20-40min, and then vulcanize at 150-180℃ for 2-3h.

9. The high temperature resistant rubber latex according to claim 1 is used in aerospace equipment.

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