Brominated butyl rubber airtight layer sizing material and mixing process thereof

Abstract

The invention relates to the field of rubber mixing, in particular to a brominated butyl rubber inner liner sizing material and a mixing technology thereof.The brominated butyl rubber inner liner sizing material is prepared from, by mass, 70-90 parts of brominated butyl rubber, 20-40 parts of natural rubber, 50-60 parts of N660 carbon black, 10-20 parts of EN660 carbon black, 10-20 parts of NM360 carbon black, 30-35 parts of masterbatch small materials, 7-10 parts of naphthenic oil and 5-8 parts of final mixed rubber small materials; the air-tight layer formula cost can be reduced, the benefit is improved, and the emission of carbon dioxide is reduced; according to the mixing process of the brominated butyl rubber inner liner rubber material, the EN660 carbon black master batch is firstly produced, and then the inner liner rubber material is produced, so that the problem that carbon black powder is not dispersed in the current mixing process of the inner liner rubber material can be solved, the tensile strength and the elongation at break of the brominated butyl rubber inner liner rubber material are improved, and the whole mixing process is simple and convenient and is suitable for industrial production. The operability is high, equipment transformation and investment are not needed, and the production quality requirement is met.

Description

Technical Field

[0001] The invention relates to the field of rubber mixing, in particular to a brominated butyl rubber airtight layer rubber material and a mixing process thereof. Background Art

[0002] Recycled (environmentally friendly) carbon black can be used for tire remanufacturing, reducing the production cost of tire manufacturing and forming an industrial chain cycle of waste tires - pyrolytic carbon black - tires. Every kilogram of recycled environmentally friendly carbon black replacing traditional ordinary carbon black can save about 1.5-2 kilograms of crude oil. This also means that every ton of recycled environmentally friendly carbon black replacing traditional carbon black can reduce carbon dioxide emissions by approximately 3 tons.

[0003] The application research of environmentally friendly new materials has always been a hot topic for rubber formulators. Using recycled (environmentally friendly) thermal cracking carbon black EN660 to replace part of the traditional N660 carbon black in the formula of bromobutyl rubber airtight layer can reduce the cost of the airtight layer formula and bring certain benefits to the company's production and manufacturing. However, there are differences between cracking carbon black and commercial carbon black. Among them, the raw materials of commercial carbon black are natural gas and heavy oil, and the main component is 90% carbon element, and there are also a small amount of nitrogen element, oxygen element, etc., and the ash content is low. However, cracking carbon black is the product of high-temperature cracking of waste tires, mainly composed of carbon in aliphatic and aromatic compounds. A small part of the rubber hydrocarbon molecules in the tire cannot be fully cracked, and eventually a carbonaceous sediment will be formed to adsorb on the surface of cracking carbon black, which reduces the surface activity of cracking carbon black.

[0004] In the process of preparing brominated butyl rubber airtight layer rubber compound using the existing mixing process (adding rubber, carbon black, small materials, etc. in the same mixing step), the inventor found that there was undispersed carbon black powder material in the cross section of the rubber compound, which greatly affected the physical properties of the final rubber compound. Therefore, only by solving the problem of carbon black dispersion can the thermal cracking carbon black EN660 be further applied. Based on this, the present invention proposes a brominated butyl rubber airtight layer rubber compound and its mixing process. Summary of the invention

[0005] The purpose of the present invention is to provide a brominated butyl rubber airtight layer rubber compound and a mixing process thereof. By adopting recycled (environmentally friendly) thermal cracking carbon black EN660 to replace part of traditional N660 carbon black in the brominated butyl rubber airtight layer rubber compound formula, the airtight layer formula cost can be reduced, certain benefits can be brought to the company's production and manufacturing, and the emission of carbon dioxide can be reduced. In combination with the mixing process of the brominated butyl rubber airtight layer rubber compound of the present invention, by first producing EN660 carbon black masterbatch and then producing the airtight layer rubber compound, the problem of undispersed carbon black powder in the current airtight layer rubber compound mixing process can be solved, the tensile strength and elongation at break of the brominated butyl rubber airtight layer rubber compound can be improved, the entire mixing process is simple and convenient, the operability is strong, no equipment modification and investment are required, and the production quality requirements are met.

[0006] In order to solve the above technical problems, the present invention provides a brominated butyl rubber airtight layer rubber material, wherein the brominated butyl rubber airtight layer rubber material is composed of the following raw materials in parts by weight:

[0007] 70-90 parts of brominated butyl rubber, 20-40 parts of natural rubber, 50-60 parts of N660 carbon black, 10-20 parts of EN660 carbon black, 10-20 parts of NM360 carbon black, 30-35 parts of masterbatch, 7-10 parts of cyclohexane oil, and 5-8 parts of final rubber batch.

[0008] Preferably, the masterbatch is composed of the following raw materials in parts by mass: 10 to 20 parts of calcium carbonate, 0.5 to 1 part of magnesium oxide, 0.5 to 1 part of stearic acid, 5 to 8 parts of 204 resin, and 9 to 12 parts of C5 resin.

[0009] Preferably, the final rubber mix is ​​composed of the following raw materials in parts by weight: 4m 2 3-5 parts of zinc oxide, 0.5-1 part of insoluble sulfur IS7020, 1-2 parts of accelerator DM.

[0010] On the other hand, the present invention also provides a mixing process for a brominated butyl rubber airtight layer rubber compound, and the mixing process comprises the following steps to prepare the brominated butyl rubber airtight layer rubber compound:

[0011] S1. Preparation of brominated butyl rubber inner liner masterbatch

[0012] 20-40 parts of natural rubber are added to the internal mixer, crushed and mixed at a speed of 55rpm for 30 seconds, and then 10-20 parts of EN660 carbon black are added to the internal mixer, crushed and mixed at a speed of 55rpm, and when the temperature of the rubber material reaches 130-140℃, the top bolt is raised and paused for 5-10 seconds, and the pressing bolt is pressed to continue mixing until the temperature reaches 160-170℃ for rubber discharge, and after the sheet is discharged through the twin-screw extruder, it passes through the isolation agent pool and then hangs the curtain to cool and collect to obtain EN660 masterbatch;

[0013] Then, 30 to 60 parts of EN660 masterbatch and 70 to 90 parts of brominated butyl rubber are added to the internal mixer, crushed and mixed at a speed of 40 rpm for 30 seconds, and then 50 to 60 parts of N660 carbon black and 10 to 20 parts of NM360 carbon black are added to the internal mixer, crushed and mixed at a speed of 40 rpm for 30 seconds, and then 30 to 35 parts of masterbatch small materials are added to the internal mixer, and mixed at a speed of 40 rpm until the temperature of the rubber material reaches 90 to 105° C., 7 to 10 parts of cyclohexane oil are added, and mixing is continued. When the temperature reaches 115 to 125° C., the top bolt is raised and paused for 5 to 10 seconds, and the pressure bolt is pressed to continue mixing until the temperature reaches 130 to 135° C. for rubber discharge, and after being discharged through a twin-screw extruder, it is collected after being cooled by a curtain through an isolation agent pool to obtain an airtight layer masterbatch rubber material;

[0014] S2. Preparation of final rubber compound for brominated butyl rubber inner liner

[0015] Add 200-210 parts of the masterbatch of the inner liner and 5-8 parts of the final rubber batch into an internal mixer, crush and mix at a speed of 20-30 rpm for 120-140 seconds, lift the top plug to discharge the rubber, and after the sheets are discharged from the open mixer, they are passed through an isolation agent pool and cooled by a curtain to obtain the final rubber batch of the brominated butyl rubber inner liner, i.e., the brominated butyl rubber inner liner compound.

[0016] Preferably, the masterbatch in step S1 is composed of the following raw materials in parts by mass: 10 to 20 parts of calcium carbonate, 0.5 to 1 part of magnesium oxide, 0.5 to 1 part of stearic acid, 5 to 8 parts of 204 resin, and 9 to 12 parts of C5 resin.

[0017] Preferably, the final rubber mix in step S2 is composed of the following raw materials in parts by weight: 4m 2 3-5 parts of zinc oxide, 0.5-1 part of insoluble sulfur IS7020, 1-2 parts of accelerator DM.

[0018] Preferably, the temperature of the collected product after passing through the isolation agent pool and then cooling with a curtain in step S1 is ≤42°C.

[0019] Preferably, the temperature of the collected material after passing through the release agent pool and then cooling with a curtain in step S2 is ≤46°C in June-October, and ≤43°C in January-May and November-December.

[0020] The beneficial effects of the present invention are:

[0021] 1. The brominated butyl rubber airtight layer rubber material of the present invention adopts the following formula: 70-90 parts of brominated butyl rubber, 20-40 parts of natural rubber, 50-60 parts of N660 carbon black, 10-20 parts of EN660 carbon black, 10-20 parts of NM360 carbon black, 30-35 parts of masterbatch, 7-10 parts of cyclohexane oil, and 5-8 parts of final rubber mix; the formula uses recycled (environmentally friendly) thermal cracking carbon black EN660 to replace part of the traditional N660 carbon black, which can reduce the cost of the airtight layer formula, bring certain benefits to the company's production and manufacturing, and reduce the emission of carbon dioxide;

[0022] In combination with the mixing process of the brominated butyl rubber airtight layer compound of the present invention, by first producing EN660 carbon black masterbatch and then producing the airtight layer compound, the problem of non-dispersion of carbon black powder in the current mixing process of the airtight layer compound can be solved, and the tensile strength and elongation at break of the brominated butyl rubber airtight layer compound can be improved. The entire mixing process is simple and convenient, has strong operability, does not require equipment modification and investment, and meets production quality requirements.

[0023] 2. The brominated butyl rubber airtight layer rubber compound of the present invention can not only solve the current technical problem of poor dispersion of carbon black during the mixing process of the present invention, but also obtain a brominated butyl rubber airtight layer rubber compound with higher tensile strength and elongation at break, with the average tensile strength reaching 9.71 MPa and the average elongation at break reaching 715%. The higher elongation at break makes the rubber compound more fatigue-resistant in dynamic deformation and reduces microcracks caused by repeated stretching. At the same time, the improvement of tensile strength can resist external mechanical damage, effectively reduce the gas permeability of the airtight layer under high pressure, maintain the internal air pressure of the tire stable, and jointly delay the aging speed of the airtight layer, thereby improving the practicality of the brominated butyl rubber airtight layer rubber compound of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 is a cross-sectional photograph of the brominated butyl rubber airtight layer masterbatch rubber material A of Example 1 of the present invention, in which there is no undispersed carbon black powder on the cross section of the rubber material;

[0026] Figure 2 This is a cross-sectional photograph of the brominated butyl rubber airtight layer masterbatch rubber material B of Comparative Example 1, in which there is obvious undispersed carbon black powder on the cross section of the rubber material;

[0027] Figure 3This is a cross-sectional photograph of the brominated butyl rubber airtight layer masterbatch rubber compound C of comparative example 2, in which there is obvious undispersed carbon black powder on the cross section of the rubber compound. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The brominated butyl rubber airtight layer rubber material of the present invention is composed of the following raw materials in parts by weight:

[0030] 70-90 parts of brominated butyl rubber, 20-40 parts of natural rubber, 50-60 parts of N660 carbon black, 10-20 parts of EN660 carbon black, 10-20 parts of NM360 carbon black, 30-35 parts of masterbatch, 7-10 parts of naphthenic oil, 5-8 parts of final rubber mix;

[0031] Among them, the masterbatch is composed of the following raw materials in parts by weight: 10-20 parts of calcium carbonate, 0.5-1 parts of magnesium oxide, 0.5-1 parts of stearic acid, 5-8 parts of 204 resin, and 9-12 parts of C5 resin; the final rubber mix is ​​composed of the following raw materials in parts by weight: 4m 2 3-5 parts of zinc oxide, 0.5-1 part of insoluble sulfur IS7020, 1-2 parts of accelerator DM.

[0032] On the other hand, the present invention also provides a mixing process for preparing a brominated butyl rubber airtight layer rubber compound, wherein the mixing process comprises the following steps:

[0033] Example 1

[0034] S1. Preparation of brominated butyl rubber inner liner masterbatch

[0035] 20-40 parts of natural rubber are added to the internal mixer, crushed and mixed at a speed of 55rpm for 30 seconds, and then 10-20 parts of EN660 carbon black are added to the internal mixer, crushed and mixed at a speed of 55rpm, and when the temperature of the rubber compound reaches 130-140℃, the top bolt is raised and paused for 5-10 seconds, and the pressing bolt is pressed to continue mixing until the temperature reaches 160-170℃ for rubber discharge, and after the sheet is discharged through the twin-screw extruder, it passes through the isolation agent pool and then hangs the curtain for cooling. The collected temperature is ≤42℃ to obtain EN660 masterbatch rubber compound;

[0036] Then, 30-60 parts of EN660 masterbatch and 70-90 parts of brominated butyl rubber are added to the internal mixer, crushed and mixed at a speed of 40 rpm for 30 seconds, and then 50-60 parts of N660 carbon black and 10-20 parts of NM360 carbon black are added to the internal mixer, crushed and mixed at a speed of 40 rpm for 30 seconds, and then 30-35 parts of masterbatch small batches are added to the internal mixer, and mixed at a speed of 40 rpm until the temperature of the rubber material reaches 90-105° C., 7-10 parts of cyclohexane oil are added, and mixing is continued. When the temperature reaches 115-125° C., the top bolt is raised and paused for 5-10 seconds, and the pressure bolt is pressed to continue mixing until the temperature reaches 130-135° C. for rubber discharge, and after the twin-screw extruder is discharged, the temperature collected after passing through the isolation agent pool and curtain cooling is ≤42° C., and the airtight layer masterbatch rubber material A is obtained;

[0037] S2. Preparation of final rubber compound for brominated butyl rubber inner liner

[0038] Add 200-210 parts of the above-mentioned air-inner layer masterbatch rubber material A and 5-8 parts of the final rubber batch into an internal mixer, crush and mix at a rotation speed of 20-30 rpm for 120-140 seconds, lift the top plug to discharge the rubber, and after the sheets are discharged from the open mixer, they are passed through an isolation agent pool and cooled under a curtain, and the final rubber batch of the brominated butyl rubber air-inner layer is obtained, i.e., the brominated butyl rubber air-inner layer rubber material, which is recorded as sample A.

[0039] Comparative Example 1

[0040] S1. Preparation of brominated butyl rubber inner liner masterbatch

[0041] 70-90 parts of brominated butyl rubber and 20-40 parts of natural rubber are added to an internal mixer, crushed and mixed at a speed of 40 rpm for 30 seconds, and then 50-60 parts of N660 carbon black, 10-20 parts of EN660 carbon black, and 10-20 parts of NM360 carbon black are added to the internal mixer, crushed and mixed at a speed of 40 rpm for 30 seconds, and then 30-35 parts of masterbatch are added to the internal mixer, and mixed at a speed of 40 rpm. When the temperature of the rubber material reaches 90-105°C, 7-10 parts of cyclohexane oil are added, and mixing is continued. When the temperature reaches 115-125°C, the top bolt is raised and paused for 5-10 seconds, and the pressure bolt is pressed to continue mixing until the temperature reaches 130-135°C for rubber discharge. After the twin-screw extruder is discharged, the airtight layer masterbatch rubber material B is obtained after cooling through the release agent pool and curtain cooling.

[0042] S2. Preparation of final rubber compound for brominated butyl rubber inner liner

[0043] Add 200-210 parts of the airtight layer masterbatch rubber material B and 5-8 parts of the final rubber batch into an internal mixer, crush and mix at a speed of 20-30 rpm for 120-140 seconds, lift the top plug to discharge the rubber, and after the sheets are discharged from the open mixer, they are passed through an isolation agent pool and cooled under a curtain, and the final rubber batch of the brominated butyl rubber airtight layer is obtained, i.e., the brominated butyl rubber airtight layer rubber material, which is recorded as sample B.

[0044] Comparative Example 2

[0045] S1. Preparation of brominated butyl rubber inner liner masterbatch

[0046] 70-90 parts of brominated butyl rubber and 20-40 parts of natural rubber are added to an internal mixer, crushed and mixed at 40 rpm for 30 seconds, then 50-60 parts of N660 carbon black, 10-20 parts of EN660 carbon black and 10-20 parts of NM360 carbon black are added to the internal mixer, crushed and mixed at 40 rpm for 40-50 seconds, then 30-35 parts of masterbatch are added to the internal mixer, mixed at 40 rpm, and when the temperature of the rubber material reaches 90-105°C, 7-10 parts of cyclohexane oil are added, and mixing is continued. When the temperature reaches 115-125°C, the top bolt is raised and paused for 5-10 seconds, and the pressure bolt is pressed to continue mixing until the temperature reaches 130-135°C for rubber discharge, and after the sheet is discharged through a twin-screw extruder, it is collected after cooling through a release agent pool and curtains to obtain rubber material C;

[0047] S2. Preparation of final rubber compound for brominated butyl rubber inner liner

[0048] Add 200-210 parts of the airtight layer masterbatch rubber material C and 5-8 parts of the final rubber batch into an internal mixer, crush and mix at a speed of 20-30 rpm for 120-140 seconds, lift the top plug to discharge the rubber, and after the sheets are discharged from the open mixer, they are passed through an isolation agent pool and cooled by a hanging curtain, and the final rubber batch of the brominated butyl rubber airtight layer is obtained, i.e., the brominated butyl rubber airtight layer rubber material, which is recorded as sample C.

[0049] In the above-mentioned Example 1, Comparative Example 1 and Comparative Example 2, the masterbatch is composed of the following raw materials in parts by weight: 10 to 20 parts of calcium carbonate, 0.5 to 1 part of magnesium oxide, 0.5 to 1 part of stearic acid, 5 to 8 parts of 204 resin, and 9 to 12 parts of C5 resin; the final rubber compound is composed of the following raw materials in parts by weight: 3 to 5 parts of 4m2 zinc oxide, 0.5 to 1 part of insoluble sulfur IS7020, and 1 to 2 parts of accelerator DM.

[0050] According to the experimental results of Example 1, Comparative Example 1 and Comparative Example 2, the brominated butyl rubber airtight layer masterbatch rubber material A prepared by the mixing process of the present invention is as follows Figure 1As shown in the cross-sectional photo of the rubber compound, there is almost no undispersed carbon black powder on the cross section of the rubber compound, which meets the production quality requirements and solves the problem of poor carbon black dispersion.

[0051] like Figure 2 As shown, the rubber material B obtained by the mixing process of comparative example 1, from the cross-sectional photo of the rubber material, it can be seen that there is obvious undispersed carbon black powder on the cross section of the rubber material, which directly indicates that the current mixing uniformity is not good;

[0052] like Figure 3 As shown, the rubber C obtained by the mixing process of Comparative Example 2, although the time for the carbon black mixing and dispersion stage in Comparative Example 2 was extended, it can be seen from the cross-sectional photo of the rubber in Comparative Example 2 that there is still obvious undispersed carbon black powder on the cross section of the rubber, but it is improved compared with Comparative Example 1, indicating that the extension of the carbon black mixing time has a certain improvement on the dispersion of the carbon black powder.

[0053] In addition, the final rubber compound samples A, B, and C were tested for physical properties before aging, and the test results are as follows:

[0054]

[0055] Comparison table of physical properties of final rubber before aging

[0056] It can be seen from the above data that sample A has higher tensile strength and elongation at break, indicating that the brominated butyl rubber airtight layer rubber compound of the present invention can not only solve the current technical problem of poor dispersion of carbon black during the mixing process of the present invention, but also obtain a brominated butyl rubber airtight layer rubber compound with higher tensile strength and elongation at break, with an average tensile strength of 9.71 MPa and an average elongation at break of 715%, wherein the higher elongation at break makes the rubber compound more fatigue-resistant in dynamic deformation and reduces microcracks caused by repeated stretching; at the same time, the improvement of tensile strength can resist external mechanical damage, effectively reduce the gas permeability of the airtight layer under high pressure, maintain the internal air pressure of the tire stable, and jointly delay the aging speed of the airtight layer;

[0057] The brominated butyl rubber airtight layer rubber material of the present invention adopts the following formula: 70-90 parts of brominated butyl rubber, 20-40 parts of natural rubber, 50-60 parts of N660 carbon black, 10-20 parts of EN660 carbon black, 10-20 parts of NM360 carbon black, 30-35 parts of masterbatch, 7-10 parts of cyclohexane oil, and 5-8 parts of final rubber mix; the recycled (environmentally friendly) thermal cracking carbon black EN660 is used in the brominated butyl rubber airtight layer rubber material formula to replace part of the traditional N660 carbon black, which can reduce the airtight layer formula cost, bring certain benefits to the company's production and manufacturing, and reduce the emission of carbon dioxide;

[0058] In combination with the mixing process of the present invention, by first producing EN660 carbon black masterbatch and then producing the airtight layer rubber compound, the problem of uneven filler dispersion in the current mixing process of the airtight layer rubber compound is solved, the tensile strength and elongation at break of the brominated butyl rubber airtight layer rubber compound are improved, the entire mixing process is simple and convenient, the operability is strong, no equipment modification and investment are required, and the production quality requirements are met.

[0059] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A brominated butyl rubber airtight layer rubber material, characterized in that: The brominated butyl rubber airtight layer rubber material is composed of the following raw materials in parts by weight: 70-90 parts of brominated butyl rubber, 20-40 parts of natural rubber, 50-60 parts of N660 carbon black, 10-20 parts of EN660 carbon black, 10-20 parts of NM360 carbon black, 30-35 parts of masterbatch, 7-10 parts of cyclohexane oil, and 5-8 parts of final rubber batch.

2. The brominated butyl rubber airtight layer compound according to claim 1, characterized in that: The masterbatch is composed of the following raw materials in parts by weight: 10 to 20 parts of calcium carbonate, 0.5 to 1 part of magnesium oxide, 0.5 to 1 part of stearic acid, 5 to 8 parts of 204 resin, and 9 to 12 parts of C5 resin.

3. The brominated butyl rubber airtight layer rubber material according to claim 1, characterized in that: The final rubber mix is ​​composed of the following raw materials in parts by weight: 2 3-5 parts of zinc oxide, 0.5-1 part of insoluble sulfur IS7020, 1-2 parts of accelerator DM.

4. A mixing process for a brominated butyl rubber airtight layer compound, for preparing the brominated butyl rubber airtight layer compound as claimed in any one of claims 1 to 3, characterized in that: The mixing process comprises the following steps: S1. Preparation of brominated butyl rubber inner liner masterbatch 20-40 parts of natural rubber are added to the internal mixer, crushed and mixed at a speed of 55rpm for 30 seconds, and then 10-20 parts of EN660 carbon black are added to the internal mixer, crushed and mixed at a speed of 55rpm, and when the temperature of the rubber material reaches 130-140℃, the top bolt is raised and paused for 5-10 seconds, and the pressing bolt is pressed to continue mixing until the temperature reaches 160-170℃ for rubber discharge, and after the sheet is discharged through the twin-screw extruder, it passes through the isolation agent pool and then hangs the curtain to cool and collect to obtain EN660 masterbatch; Then, 30 to 60 parts of EN660 masterbatch and 70 to 90 parts of brominated butyl rubber are added to the internal mixer, crushed and mixed at a speed of 40 rpm for 30 seconds, and then 50 to 60 parts of N660 carbon black and 10 to 20 parts of NM360 carbon black are added to the internal mixer, crushed and mixed at a speed of 40 rpm for 30 seconds, and then 30 to 35 parts of masterbatch small materials are added to the internal mixer, and mixed at a speed of 40 rpm until the temperature of the rubber material reaches 90 to 105° C., 7 to 10 parts of cyclohexane oil are added, and mixing is continued. When the temperature reaches 115 to 125° C., the top bolt is raised and paused for 5 to 10 seconds, and the pressure bolt is pressed to continue mixing until the temperature reaches 130 to 135° C. for rubber discharge, and after being discharged through a twin-screw extruder, it is collected after being cooled by a curtain through an isolation agent pool to obtain an airtight layer masterbatch rubber material; S2. Preparation of final rubber compound for brominated butyl rubber inner liner Add 200-210 parts of the masterbatch of the inner liner and 5-8 parts of the final rubber batch into an internal mixer, crush and mix at a speed of 20-30 rpm for 120-140 seconds, lift the top plug to discharge the rubber, and after the sheets are discharged from the open mixer, they are passed through an isolation agent pool and cooled by a curtain to obtain the final rubber batch of the brominated butyl rubber inner liner, i.e., the brominated butyl rubber inner liner compound.

5. A mixing process for a brominated butyl rubber airtight layer compound according to claim 4, characterized in that: The masterbatch in step S1 is composed of the following raw materials in parts by weight: 10 to 20 parts of calcium carbonate, 0.5 to 1 part of magnesium oxide, 0.5 to 1 part of stearic acid, 5 to 8 parts of 204 resin, and 9 to 12 parts of C5 resin.

6. The mixing process of a brominated butyl rubber airtight layer compound according to claim 4, characterized in that: The final rubber mix in step S2 is composed of the following raw materials in parts by weight: 2 3-5 parts of zinc oxide, 0.5-1 part of insoluble sulfur IS7020, 1-2 parts of accelerator DM.

7. The mixing process of a brominated butyl rubber airtight layer compound according to claim 4, characterized in that: The temperature of the collected product after passing through the isolation agent pool and then hanging curtain cooling in step S1 is ≤42°C.

8. The mixing process of a brominated butyl rubber airtight layer compound according to claim 4, characterized in that: The temperature of the collected water after passing through the isolation agent pool and then cooling with curtains in step S2 is ≤46°C in June-October, and ≤43°C in January-May and November-December.

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