Low-temperature-resistant brominated butyl rubber material and preparation method thereof

Abstract

The invention relates to the field of rubber, and particularly discloses a low-temperature-resistant brominated butyl rubber material and a preparation method thereof. The low-temperature-resistant brominated butyl rubber material comprises the following raw materials in parts by weight: 100 parts of raw brominated butyl rubber with the brand of Ehxon 22255; 55 to 67 parts of carbon black N550; 3 to 7 parts of paraffin oil; 0.7 to 1.3 parts of stearic acid; 0.4 to 0.6 part of zinc oxide; 4-6 parts of a vulcanizing agent pre-crosslinking preparation A86; and 0.8 to 1.3 parts of a plasticizer TP-95. The preparation method comprises the following steps: plasticating raw rubber; adding part of the raw materials for banburying; adding the rest raw materials for mixing. According to the low-temperature-resistant brominated butyl rubber material, the requirement for the high bromine content of brominated butyl rubber is met, and meanwhile the low glass transition temperature of brominated butyl rubber is kept.

Description

Technical Field

[0001] The present application relates to the field of rubber, and more specifically, to a low-temperature resistant bromobutyl rubber material and a preparation method thereof. Background Art

[0002] Bromobutyl rubber (BIIR) is an isobutene-isoprene copolymer elastomer containing active bromine. Since bromobutyl rubber has a substantially saturated main chain of butyl rubber, it has various performance characteristics of butyl polymers, such as high physical strength, good vibration damping performance, low permeability, aging resistance, and weather aging resistance.

[0003] The higher the bromine content, the better the mechanical properties such as the tensile strength of bromobutyl rubber, but its glass transition temperature is also higher, resulting in poor low-temperature resistance. Summary of the Invention

[0004] In order to keep a low glass transition temperature while meeting the high bromine content of bromobutyl rubber, the present application provides a low-temperature resistant bromobutyl rubber material and a preparation method thereof.

[0005] In the first aspect, the present application provides a low-temperature resistant bromobutyl rubber material, adopting the following technical solution: A low-temperature resistant bromobutyl rubber material, comprising the following raw materials in parts by weight: Raw bromobutyl rubber, with the brand of Exxon 2255, 100 parts; Carbon black N550, 55 - 67 parts; Paraffin oil, 3 - 7 parts; Stearic acid, 0.7 - 1.3 parts; Zinc oxide, 0.4 - 0.6 parts; Vulcanizing agent pre-crosslinking preparation A86, 4 - 6 parts; Plasticizer TP-95, 0.8 - 1.3 parts.

[0006] By adopting the above technical solution, since raw bromobutyl rubber with the brand of Exxon 2255 is used, high bromine content and high mechanical strength can be maintained. An appropriate amount of carbon black N550 can balance the mechanical strength and low-temperature performance of the BIIR material. The compounding of paraffin oil and plasticizer TP-95 helps to provide good flexibility to the BIIR material, reduce the glass transition temperature. Using A86 as the vulcanizing agent pre-crosslinking preparation, the formed crosslinking bonds have good flexibility and are not easily embrittled at low temperatures, and can form a flexible crosslinking network to reduce the glass transition temperature. Therefore, the effect of keeping a low glass transition temperature while meeting the high bromine content of bromobutyl rubber is obtained.

[0007] Optionally, the low-temperature resistant bromobutyl rubber material comprises the following raw materials in parts by weight: Raw bromobutyl rubber, with the brand name Exxon 2255, 100 parts; Carbon black N550, 60 parts; Paraffin oil, 5 parts; Stearic acid, 1 part; Zinc oxide, 0.5 part; Vulcanizing agent pre-crosslinking preparation A86, 5 parts; Plasticizer TP-95, 1 part.

[0008] By adopting the above technical solution and the above ratio, the prepared low-temperature resistant bromobutyl rubber material has a lower glass transition temperature.

[0009] Optionally, the low-temperature resistant bromobutyl rubber material further comprises 6-12 parts by weight of a low-temperature resistant additive.

[0010] By adopting the above technical solution, the addition of the low-temperature resistant additive can effectively further reduce the glass transition temperature of the material.

[0011] Optionally, the low-temperature resistant additive comprises 1-butyl-3-methylimidazolium hexafluorophosphate and polyethylene glycol grafted cellulose nanocrystals with a weight ratio of 2:1.

[0012] By adopting the above technical solution, 1-butyl-3-methylimidazolium hexafluorophosphate can be used as a molecular lubricant, inserted between the BIIR chain segments to reduce its glass transition temperature, improve low-temperature flexibility, and inhibit crystallization at the same time. Polyethylene glycol grafted cellulose nanocrystals, as a kind of nano-filler, cellulose nanocrystals have high modulus and high strength. Through surface grafting of flexible chain polyethylene glycol, on the one hand, the polyethylene glycol chain segments help to improve its dispersibility and interfacial interaction in the BIIR matrix, enhancing the flexibility of the material; on the other hand, the two form a "rigid-flexible" synergistic effect, enhancing the low-temperature performance of BIIR and inhibiting the rigidification of molecular chains. Moreover, polyethylene glycol grafted cellulose nanocrystals can not only enhance the overall performance of the material, but also act as an interface regulator to help improve the compatibility between 1-butyl-3-methylimidazolium hexafluorophosphate and BIIR, enabling the low-temperature resistant additive to have good binding with the BIIR matrix as a whole and play a stronger role.

[0013] Optionally, the preparation method of the low-temperature resistant additive is: taking 1-butyl-3-methylimidazolium hexafluorophosphate and polyethylene glycol grafted cellulose nanocrystals according to the ratio and mixing them evenly.

[0014] Optionally, the low-temperature resistant bromobutyl rubber material further comprises 2-3 parts by weight of nano-clay and 1-2 parts by weight of bacterial cellulose.

[0015] By adopting the above technical solutions, first, polyethylene glycol grafted cellulose nanocrystals have certain hygroscopicity, which easily affects their effect on reducing the glass transition temperature of BIIR materials. Nanoclay can effectively improve the hygroscopicity of polyethylene glycol grafted cellulose nanocrystals. Secondly, the polar groups of bacterial cellulose can interfere with the regular arrangement of BIIR molecular chains, reducing the glass transition temperature, and can also form an interpenetrating network to inhibit the crack propagation of rubber materials. Nanoclay has a lamellar structure and can further resist the impact stress generated by crack propagation. Finally, nanoclay and bacterial cellulose can jointly serve as physical crosslinking points, cooperate with 1-butyl-3-methylimidazolium hexafluorophosphate to form a "rigid-flexible combination" network, enabling the BIIR material to maintain elasticity at low temperatures.

[0016] In a second aspect, the present application provides a method for preparing a low-temperature resistant bromobutyl rubber material, adopting the following technical solutions: A method for preparing a low-temperature resistant bromobutyl rubber material, comprising the following steps: Plasticize the bromobutyl rubber raw rubber for 2 minutes, then add carbon black N550 and plasticizer TP-95 and carry out internal mixing for 10-15 minutes at an internal mixing temperature of 130-150°C to obtain a mixed rubber; then add paraffin oil, stearic acid, zinc oxide, and a pre-crosslinking agent A86 for the vulcanizing agent to the mixed rubber on an open mill, with a roll temperature of 40-50°C and a roll gap of 2-3 mm, thin pass 3 times in the form of a triangular wrap, taking 7-10 minutes, and then take out the sheet. After standing at room temperature in a ventilated place for 3 hours, a low-temperature resistant bromobutyl rubber material is prepared.

[0017] By adopting the above technical solutions, the low-temperature resistant bromobutyl rubber material prepared by this method has excellent high bromine content and low glass transition temperature.

[0018] In a third aspect, the present application provides a method for preparing a low-temperature resistant bromobutyl rubber material, adopting the following technical solutions: A method for preparing a low-temperature resistant bromobutyl rubber material, comprising the following steps: Plasticize the bromobutyl rubber raw rubber for 2 minutes, then add carbon black N550, plasticizer TP-95 and a low-temperature resistant additive and carry out internal mixing for 10-15 minutes at an internal mixing temperature of 130-150°C to obtain a mixed rubber; then add paraffin oil, stearic acid, zinc oxide, and a pre-crosslinking agent A86 for the vulcanizing agent to the mixed rubber on an open mill, with a roll temperature of 40-50°C and a roll gap of 2-3 mm, thin pass 3 times in the form of a triangular wrap, taking 7-10 minutes, and then take out the sheet. After standing at room temperature in a ventilated place for 3 hours, a low-temperature resistant bromobutyl rubber material is prepared.

[0019] By adopting the above technical solutions, the low-temperature resistant bromobutyl rubber material prepared by this method has an even lower glass transition temperature.

[0020] Fourth aspect, the present application provides a preparation method of a low-temperature resistant bromobutyl rubber material, adopting the following technical solution: A preparation method of a low-temperature resistant bromobutyl rubber material, comprising the following steps: Plasticate the bromobutyl rubber raw rubber for 2 minutes, then add carbon black N550, plasticizer TP-95, low-temperature resistant additive, nano-clay and bacterial cellulose and carry out internal mixing for 10-15 minutes at an internal mixing temperature of 130-150 °C to obtain a mixed rubber; then add paraffin oil, stearic acid, zinc oxide, and vulcanizing agent pre-crosslinking agent A86 to the mixed rubber in an open mill, with a roll temperature of 40-50 °C and a roll gap of 2-3 mm, and thin pass 3 times in the form of a triangular wrap, taking 7-10 minutes, then take out the sheet, and let it stand at room temperature and in a ventilated place for 3 hours to obtain the low-temperature resistant bromobutyl rubber material.

[0021] By adopting the above technical solution, the low-temperature resistant bromobutyl rubber material prepared by this method has a lower glass transition temperature.

[0022] In summary, the present application has the following beneficial effects: 1. Since the bromobutyl rubber raw rubber with the brand of Exxon 2255 is adopted in the present application, it can maintain a high bromine content and high mechanical strength. An appropriate amount of carbon black N550 can balance the mechanical strength and low-temperature performance of the BIIR material. The compounding of paraffin oil and plasticizer TP-95 helps to provide good flexibility to the BIIR material, reduce the glass transition temperature, and use A86 as the vulcanizing agent pre-crosslinking agent, the generated crosslinking bonds have good flexibility and are not prone to embrittlement at low temperatures, and can form a flexible crosslinking network, reducing the glass transition temperature. Therefore, the effect of maintaining a lower glass transition temperature while meeting the high bromine content of bromobutyl rubber is obtained.

[0023] 2. In the present application, a low-temperature resistant additive is preferably adopted, and through the "rigidity-flexibility" synergistic effect, the low-temperature performance of BIIR is enhanced and the rigidification of molecular chains is inhibited.

[0024] 3. The low-temperature resistant bromobutyl rubber material prepared by the method of the present application has excellent high bromine content and low glass transition temperature. Specific embodiments

[0025] The following further elaborates the present application in conjunction with embodiments. It should be specifically noted that: those not specifying specific conditions in the following embodiments are carried out according to conventional conditions or conditions recommended by the manufacturer, and the raw materials used in the following embodiments can be obtained from ordinary commercial sources unless otherwise specified.

[0026] The CNC aqueous solution adopts a cotton cellulose nanocrystal dispersion liquid with a solid content of 8.5%, and is purchased from Guilin Qihong Technology Co., Ltd.

[0027] Polyethylene glycol diglycidyl ether (PEG), with a molecular weight of 500, was purchased from Aladdin Reagent (Shanghai) Co., Ltd.

[0028] Sodium hydroxide (NaOH), analytical grade, was purchased from Chongqing Chuandong Chemical Group Co., Ltd.

[0029] Butyl-3-methylimidazolium hexafluorophosphate, namely BMIMPF6, CAS No.: 174501-64-5.

[0030] Nanoclay, with a particle size of 10 μm, CAS No.: 1318-93-0, model EFL-Nano-Clay-001, brand EFL.

[0031] Bacterial cellulose, namely BC, with a diameter of 50 nm, a length of 20 μm, surface groups -OH, and a crystal structure of cellulose type I, was purchased from Guilin Qihong Technology Co., Ltd.

[0032] Preparation example of polyethylene glycol grafted cellulose nanocrystals: Preparation example 1 The preparation method of polyethylene glycol grafted cellulose nanocrystals is as follows: The NaOH solution was gradually added dropwise to 100 g of an aqueous CNC solution with a solid content of 8.5% to make the concentration of NaOH in the solution 0.37 mol / L. While adding, magnetic stirring was carried out at a speed of 500 rpm. After 30 min, PEG with a mass ratio of 1:1 to CNC was added. The reaction solution was heated to 65 °C and stirred at a constant speed for 7 h. Then the reaction solution was cooled to room temperature, and the reaction solution was filled into a dialysis bag and dialyzed in deionized water for one week (the dialysis container volume was 5 L, and the water was changed 5 times a day) to remove sodium hydroxide and PEG that was not grafted onto CNC. When the conductivity of the dialysis solution ≤ 10 μS / cm, it indicated that NaOH and free PEG had been completely removed. After complete dialysis, freeze-drying was carried out at a freezing temperature of -50 °C, a vacuum degree of 10 Pa, and a drying time of 48 h to obtain white powder of polyethylene glycol grafted cellulose nanocrystals (CNC-g-PEG). Examples Example 1

[0033] A low-temperature resistant bromobutyl rubber material, comprising the following raw materials: Raw bromobutyl rubber, with the brand Exxon 2255, 100 g; carbon black N550, 55 g; paraffin oil, 3 g; stearic acid, 0.7 g; zinc oxide, 0.4 g; vulcanizing agent pre-crosslinking preparation A86, 4 g; plasticizer TP-95, 0.8 g.

[0034] A preparation method of a low-temperature resistant bromobutyl rubber material, comprising the following steps: Plasticize the raw bromobutyl rubber for 2 minutes at a roll temperature of 50°C and a roll gap of 0.5 mm. Then add carbon black N550 and plasticizer TP-95 and conduct internal mixing for 10 minutes at an internal mixing temperature of 150°C to obtain a mixed rubber; afterwards, add paraffin oil, stearic acid, zinc oxide, and the pre-crosslinking agent A86 of the vulcanizing agent to the mixed rubber on a two-roll mill at a roll temperature of 40°C and a roll gap of 2 mm, thin-pass 3 times in the form of a triangle wrap, which takes 10 minutes, then take out the sheet, and let it stand at room temperature in a ventilated place for 3 hours to obtain the low-temperature resistant bromobutyl rubber material. Example 2

[0035] A low-temperature resistant bromobutyl rubber material, comprising the following raw materials: Raw bromobutyl rubber, with the brand name Exxon 2255, 100 g; carbon black N550, 60 g; paraffin oil, 5 g; stearic acid, 1 g; zinc oxide, 0.5 g; pre-crosslinking agent A86 of the vulcanizing agent, 5 g; plasticizer TP-95, 1 g.

[0036] A preparation method of a low-temperature resistant bromobutyl rubber material, comprising the following steps: Plasticize the raw bromobutyl rubber for 2 minutes at a roll temperature of 50°C and a roll gap of 0.5 mm. Then add carbon black N550 and plasticizer TP-95 and conduct internal mixing for 12 minutes at an internal mixing temperature of 145°C to obtain a mixed rubber; afterwards, add paraffin oil, stearic acid, zinc oxide, and the pre-crosslinking agent A86 of the vulcanizing agent to the mixed rubber on a two-roll mill at a roll temperature of 45°C and a roll gap of 2 mm, thin-pass 3 times in the form of a triangle wrap, which takes 8 minutes, then take out the sheet, and let it stand at room temperature in a ventilated place for 3 hours to obtain the low-temperature resistant bromobutyl rubber material. Example 3

[0037] A low-temperature resistant bromobutyl rubber material, comprising the following raw materials: Raw bromobutyl rubber, with the brand name Exxon 2255, 100 g; carbon black N550, 67 g; paraffin oil, 7 g; stearic acid, 1.3 g; zinc oxide, 0.6 g; pre-crosslinking agent A86 of the vulcanizing agent, 6 g; plasticizer TP-95, 1.3 g.

[0038] A preparation method of a low-temperature resistant bromobutyl rubber material, comprising the following steps: Plasticize the raw bromobutyl rubber for 2 minutes at a roll temperature of 50°C and a roll gap of 0.5 mm. Then add carbon black N550 and plasticizer TP-95 and conduct internal mixing for 15 minutes at an internal mixing temperature of 130°C to obtain a mixed rubber; afterwards, add paraffin oil, stearic acid, zinc oxide, and the pre-crosslinking agent A86 of the vulcanizing agent to the mixed rubber on a two-roll mill at a roll temperature of 50°C and a roll gap of 3 mm, thin-pass 3 times in the form of a triangle wrap, which takes 7 minutes, then take out the sheet, and let it stand at room temperature in a ventilated place for 3 hours to obtain the low-temperature resistant bromobutyl rubber material. Example 4

[0039] The difference between this embodiment and Embodiment 2 is that the low-temperature resistant bromobutyl rubber material of this embodiment further includes 6 g of low-temperature resistant additives.

[0040] The low-temperature resistant additives are prepared by uniformly mixing 1-butyl-3-methylimidazolium hexafluorophosphate and the polyethylene glycol grafted cellulose nanocrystals prepared in Preparation Example 1 with a weight ratio of 2:1.

[0041] In the preparation method of the low-temperature resistant bromobutyl rubber material, the difference from Embodiment 2 is that the low-temperature resistant additives need to be added for internal mixing after the bromobutyl rubber raw rubber is plastified. Embodiment 5

[0042] The difference between this embodiment and Embodiment 4 is that the dosage of the low-temperature resistant additives is 9 g. Embodiment 6

[0043] The difference between this embodiment and Embodiment 4 is that the dosage of the low-temperature resistant additives is 12 g. Embodiment 7

[0044] The difference between this embodiment and Embodiment 5 is that all the low-temperature resistant additives are 1-butyl-3-methylimidazolium hexafluorophosphate. Embodiment 8

[0045] The difference between this embodiment and Embodiment 5 is that all the low-temperature resistant additives are the polyethylene glycol grafted cellulose nanocrystals prepared in Preparation Example 1. Embodiment 9

[0046] The difference between this embodiment and Embodiment 5 is that the low-temperature resistant additives are prepared by uniformly mixing 1-butyl-3-methylimidazolium hexafluorophosphate and cellulose nanocrystals with a weight ratio of 2:1. Embodiment 10

[0047] The difference between this embodiment and Embodiment 5 is that the low-temperature resistant bromobutyl rubber material further includes 2 g of nano-clay and 1 g of bacterial cellulose.

[0048] In the preparation method of the low-temperature resistant bromobutyl rubber material, the difference from Embodiment 5 is that the nano-clay and bacterial cellulose need to be added for internal mixing after the bromobutyl rubber raw rubber is plastified. Embodiment 11

[0049] The difference between this embodiment and Embodiment 10 is that the low-temperature resistant bromobutyl rubber material further includes 2.4 g of nano-clay and 1.6 g of bacterial cellulose. Embodiment 12

[0050] The difference between this example and Example 10 is that the low-temperature resistant bromobutyl rubber material further includes 3 g of nano-clay and 2 g of bacterial cellulose. Example 13

[0051] The difference between this example and Example 11 is that there is no nano-clay in the low-temperature resistant bromobutyl rubber material of this example. Example 14

[0052] The difference between this example and Example 11 is that there is no bacterial cellulose in the low-temperature resistant bromobutyl rubber material of this example.

[0053] Table 1 Dosage of each raw material in the low-temperature resistant bromobutyl rubber materials prepared in each example Comparative example Comparative example 1 A bromobutyl rubber material includes the following raw materials: Raw bromobutyl rubber, brand Exxon 2255, 100 g; carbon black N330, 60 g; naphthenic oil, 8 g; stearic acid, 1 g; zinc oxide, 3 g; sulfur, 2 g; accelerator MBTS, 1 g; accelerator TMTD, 0.5 g.

[0054] A preparation method of a bromobutyl rubber material includes the following steps: Plasticate the raw bromobutyl rubber for 2 minutes at a roll temperature of 50 °C and a roll gap of 0.5 mm. Then add zinc oxide and stearic acid and mix for 2 minutes, and then add carbon black N330 and naphthenic oil and mix for 4 minutes to obtain a mixed rubber. After that, add sulfur, accelerator MBTS, and accelerator TMTD to the mixed rubber in an open mill at a roll temperature of 45 °C and a roll gap of 2 mm, and thin-pass it 3 times in the form of a triangular wrap for 8 minutes, then take out the sheet and let it stand at room temperature in a ventilated place for 3 hours to obtain the bromobutyl rubber material.

[0055] Performance detection test Detection method 1. Refer to Method B in "GB / T 33061.11-2022 Plastics - Determination of dynamic mechanical properties - Part 11: Glass transition temperature", with a heating rate of 5 °C / min and a test frequency of 1 Hz, detect the materials prepared in the above examples and comparative examples. Select 3 specimens for each material, and take the average value of the test results of the glass transition temperature Tg. The results are shown in Table 2.

[0056] 2. According to "GB / T 528-2009 Rubber, vulcanized or thermoplastic - Determination of tensile stress - strain properties", take the materials prepared in each example and comparative example, prepare dumbbell - shaped type 1 specimens at a speed of 500 ± 50 mm / min for testing. Take 5 specimens for each material for testing, and take the average value of the results. The measured tensile strength is shown in Table 2.

[0057] 3. Referring to "GB / T 529-2008 Rubber, vulcanized or thermoplastic - Determination of tear strength", determine the tear strength of the specimens of the materials prepared in each example and comparative example. The specimens are right - angled with a cut. Test 5 specimens for each example or comparative example, and take the average value of the 5 specimens for the test results. See Table 2 for details.

[0058] 4. Referring to "GB / T 7758-2020 Rubber, vulcanized - Determination of low - temperature properties - Temperature - retraction procedure (TR test)", prepare specimens from the materials prepared in each example and comparative example. The length of the specimens is 100 mm ± 0.2 mm, and determine TR10 and TR70. Select 3 specimens for each material, and take the average value of the test results. See Table 2 for details.

[0059] Table 2 Test results Tg / °C TR10 / °C TR70 / °C Tensile strength / MPa Tear strength (kN / m) Example 1 -60 -55 -30 19.7 40.8 Example 2 -60 -55 -30 20 41 Example 3 -60 -55 -30 19.8 40.9 Example 4 -65 -60 -37 20.9 41.6 Example 5 -65 -60 -37 21.1 41.8 Example 6 -65 -60 -37 20.8 41.6 Example 7 -60 -56 -32 20.1 41.1 Example 8 -60 -56 -32 20.2 40.8 Example 9 -60 -55 -31 19.8 40.9 Example 10 -65 -61 -39 22 42 Example 11 -65 -61 -39 22.2 42.1 Example 12 -65 -61 -39 22.1 42 Example 13 -65 -60 -37 20.9 40.1 Example 14 -65 -60 -37 20.6 40 Comparative Example 1 -40 -35 -10 11.2 21.1 Combining Example 2 and Comparative Example 1 and referring to Table 2, it can be seen that the BIIR material prepared by the formula and method of the present application, while meeting the high bromine content of bromobutyl rubber, maintains a relatively low glass transition temperature, and also has excellent mechanical strength and low - temperature properties.

[0060] Combining Example 2, Example 5, Examples 7 - 9 and referring to Table 2, it can be seen that the addition of low - temperature resistant additives further reduces the glass transition temperature of the BIIR material and maintains good mechanical properties. And only when 1 - butyl - 3 - methylimidazolium hexafluorophosphate and polyethylene glycol - grafted cellulose nanocrystals are compounded, the optimal effect can be achieved.

[0061] Combining Example 5, Example 11, Example 13, Example 14 and referring to Table 2, it can be seen that after adding the compound of nanoclay and bacterial cellulose to the formula, both the low - temperature resilience performance and mechanical properties of the BIIR material are improved to a certain extent.

[0062] This specific embodiment is only an interpretation of the present application, and it is not a limitation of the present application. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A low temperature resistant brominated butyl rubber material, characterized in that: The invention comprises the following raw materials in parts by weight: Bromobutyl rubber raw rubber, brand Exxon 2255, 100 parts; Carbon black N550, 55-67 parts; Paraffin oil, 3-7 parts; Stearic acid, 0.7-1.3 parts; Zinc oxide, 0.4-0.6 parts; Vulcanizing agent pre-crosslinking preparation A86, 4 to 6 parts; Plasticizer TP-95, 0.8 to 1.3 parts.

2. A low temperature resistant brominated butyl rubber material according to claim 1, characterized in that: The low temperature resistant brominated butyl rubber material comprises the following raw materials in parts by weight: Bromobutyl rubber raw rubber, brand Exxon 2255, 100 parts; Carbon black N550, 60 parts; Paraffin oil, 5 parts; Stearic acid, 1 part; Zinc oxide, 0.5 part; Vulcanizing agent pre-crosslinking preparation A86, 5 parts; Plasticizer TP-95, 1 part.

3. The low temperature resistant brominated butyl rubber material according to claim 1, characterized in that: The low-temperature resistant brominated butyl rubber material further comprises 6 to 12 parts by weight of a low-temperature resistant auxiliary agent.

4. The low temperature resistant brominated butyl rubber material according to claim 3, characterized in that: The low temperature resistant auxiliary agent comprises 1-butyl-3-methylimidazole hexafluorophosphate and polyethylene glycol grafted cellulose nanocrystals in a weight ratio of 2:

1.

5. A low temperature resistant brominated butyl rubber material according to claim 4, characterized in that: The preparation method of the low temperature resistant auxiliary agent is as follows: 1-butyl-3-methylimidazole hexafluorophosphate and polyethylene glycol grafted cellulose nanocrystals are taken according to a ratio and mixed evenly.

6. The low temperature resistant brominated butyl rubber material according to claim 4, characterized in that: The low-temperature resistant brominated butyl rubber material further comprises 2 to 3 parts by weight of nano clay and 1 to 2 parts by weight of bacterial cellulose.

7. The method for preparing a low-temperature resistant brominated butyl rubber material according to any one of claims 1 to 2, characterized in that: The following steps are involved: The raw brominated butyl rubber was plasticized for 2 minutes, and then carbon black N550 and plasticizer TP-95 were added and mixed for 10 to 15 minutes at a mixing temperature of 130 to 150°C to obtain a mixed rubber; then paraffin oil, stearic acid, zinc oxide, and vulcanizing agent pre-crosslinking agent A86 were added to the mixed rubber in an open mill, the roller temperature was 40 to 50°C, the roller distance was 2 to 3 mm, and the mixed rubber was thinned 3 times in the form of a triangular package for 7 to 10 minutes, and then the mixed rubber was discharged and placed in a ventilated place at room temperature for 3 hours to obtain a low-temperature resistant brominated butyl rubber material.

8. The method for preparing a low-temperature resistant brominated butyl rubber material according to any one of claims 3 to 5, characterized in that: The following steps are involved: The raw brominated butyl rubber was plasticized for 2 minutes, and then carbon black N550, plasticizer TP-95 and low-temperature resistant additive were added and mixed for 10 to 15 minutes at a mixing temperature of 130 to 150°C to obtain a mixed rubber; then paraffin oil, stearic acid, zinc oxide and vulcanizing agent pre-crosslinking agent A86 were added to the mixed rubber in an open mill, the roller temperature was 40 to 50°C, the roller distance was 2 to 3 mm, and the mixture was thinned 3 times in the form of a triangular package for 7 to 10 minutes, and then the sheet was produced and placed in a ventilated place at room temperature for 3 hours to obtain a low-temperature resistant brominated butyl rubber material.

9. The method for preparing a low-temperature resistant brominated butyl rubber material according to claim 6, characterized in that: The following steps are involved: The raw brominated butyl rubber was plasticized for 2 minutes, and then carbon black N550, plasticizer TP-95, low-temperature resistant additive, nano clay and bacterial cellulose were added and mixed for 10 to 15 minutes at a mixing temperature of 130 to 150°C to obtain a mixed rubber; then paraffin oil, stearic acid, zinc oxide and vulcanizing agent pre-crosslinking agent A86 were added to the mixed rubber in an open mill, the roller temperature was 40 to 50°C, the roller distance was 2 to 3 mm, and the mixture was thinned 3 times in the form of a triangular package for 7 to 10 minutes, and then the sheet was produced and placed in a ventilated place at room temperature for 3 hours to obtain a low-temperature resistant brominated butyl rubber material.

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