Civil aviation radial tire corrugated protective layer rubber and preparation method thereof

Abstract

The application discloses a civil aviation radial tire corrugated protective layer rubber and a preparation method thereof. The rubber is prepared by using 1# tobacco sheet rubber as a main material, using N330 carbon black as a reinforcing system, using N46 machine oil as a plasticizer, using insoluble sulfur and an accelerator DZ as vulcanizing agents, using an adhesive RS, a C9 resin and an adhesive resin HT-M as an adhesive system and the like technical methods, and has high adhesion, impact resistance, tear resistance, puncture resistance, low heat build-up and good fatigue resistance by a certain mixing process. As the civil aviation radial tire corrugated protective layer rubber, the rubber has good skeleton material (aramid cord) adhesion, higher physical properties and lower heat build-up, improves the damage resistance of the civil aviation radial tire to external puncture and mechanical damage, and thus increases the durability of the tire.

Description

Technical Field

[0001] This invention relates to the field of rubber processing and production technology, specifically to a high-performance corrugated protective layer rubber for civil aviation radial tires and its preparation method. Background Technology

[0002] The corrugated protective layer is a special component of civil aviation radial tires. It is a semi-finished rubber component with a fixed thickness, made by calendering with special equipment after applying rubber to the top and bottom surfaces with a certain amplitude and wavelength using special skeleton materials and fixing the number and spacing of the corrugated layers.

[0003] The corrugated protective layer, located on the outside of the annular cylindrical belt layer, tightens the belt layer assembly, absorbs and withstands the upward stress generated by tire expansion when inflated, reducing deformation and effectively improving the uniformity of stress distribution on the belt layer. It also reduces edge stress and eliminates the phenomenon of belt layer edge separation. At the same time, it significantly improves the tire carcass's cut resistance, inhibits the occurrence, development, and circumferential expansion of tread damage, improves the tread's resistance to punctures and mechanical damage, increases tire durability, and thus enhances the overall performance of civil aviation radial tires.

[0004] The aramid cord used as the skeleton material for the corrugated protective layer, based on its operating conditions and characteristics, requires the corrugated protective layer rubber compound to possess characteristics such as high adhesion, impact resistance, tear resistance, puncture resistance, low heat generation, good fatigue resistance, and processability. This is to meet the demanding operating conditions of high-speed and high-load civil aviation radial tires. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing corrugated protective layer rubber compounds in terms of mechanical and adhesive properties, and to provide a corrugated protective layer rubber compound for civil aviation radial tires and its preparation method. This rubber compound uses No. 1 smoked sheet rubber as the main material, and adds N330 carbon black, N46 engine oil, insoluble sulfur, anti-reversion agent HVA-2, adhesive RS, C9 resin, tackifying resin HT-M, etc., as main auxiliary materials, and is prepared through a specific process according to a certain ratio and dosage. It exhibits high adhesion, impact resistance, tear resistance, puncture resistance, and good fatigue resistance, and has excellent overall performance.

[0006] To achieve the above objectives, this invention application adopts the following technical solution:

[0007] A method for preparing a protective layer adhesive for the corrugated layer of civil aviation radial tires, wherein the names and mass ratios of the raw materials comprising the protective layer adhesive are as follows:

[0008] 100 parts of No. 1 smoked sheet rubber, 5-10 parts of zinc oxide, 2-6 parts of stearic acid, 1.0-2.0 parts of antioxidant RD, 1-3 parts of antioxidant 4020, 3-5 parts of N46 machine oil, 3-5 parts of insoluble sulfur HDOT-20, 0.5-1.0 parts of accelerator DZ, 0.2-1.0 parts of anti-reversion agent HVA-2, 0.1-0.5 parts of anti-scorching agent CTP, 30-50 parts of N330 carbon black, 1-5 parts of adhesive RS, and 1-5 parts of resin mixture;

[0009] The resin mixture is prepared by adding C9 resin and tackifying resin HT-M in a sand mill at a mass ratio of 3:2 and then refining and grinding them. The particle size of the resin mixture is 2 to 3 micrometers.

[0010] The preparation method of the protective layer adhesive for the corrugated layer of civil aviation radial tires includes the following specific steps:

[0011] (1) Preparation of resin mixture: C9 resin and tackifying resin HT-M are added to a sand mill in a mass ratio and ground continuously. The feed pressure is 1.4MPa to 1.9MPa, the grinding media filling amount is 35% to 55%, and the grinding time is 10 to 30 min to obtain a resin mixture with a particle size of 2 to 3 micrometers.

[0012] (2) The No. 1 smoked sheet rubber is plasticized in an internal mixer at a speed of 30-50 rpm, an air pressure of 0.5-0.6 MPa, and a discharge temperature of 160-170℃ to obtain plasticized rubber.

[0013] (3) The prepared plasticized rubber, zinc oxide, stearic acid, antioxidant RD, antioxidant 4020, adhesive RS, and resin mixture are added to a mixer according to the mass ratio for a first-stage mixing process. The mixing speed is 30-50 rpm, the air pressure is 0.5-0.6 MPa, and when the mixing reaches 35-45 seconds and the temperature is 60-65℃, 1 / 3-2 / 3 of the required amount of N330 carbon black is added. The mixing continues until 85-95 seconds and the temperature is 90-95℃, at which point N46 machine oil is added. The mixing continues until 115-125 seconds and the temperature is 120-140℃. Add the remaining N330 carbon black at 25℃, mix for 145-155 seconds at 140-145℃, then lift and lower the top bolt once. Mix for 185-215 seconds at 150-155℃, then reduce the mixing temperature in the internal mixer to 130-135℃ by liquid nitrogen spraying. Continue mixing for 275-300 seconds to discharge the rubber at 160-165℃. Place the discharged rubber in an open mill with a thickness of 2mm and wrap it around the rollers. Cut the rubber three times on each side (3 / 4 of the length). Cool the sheet for 8-24 hours to obtain a first-stage compound.

[0014] (4) The prepared first-stage compound, insoluble sulfur HDOT-20, anti-scorching agent CTP, accelerator DZ, and anti-reversion agent HVA-2 are added to the internal mixer according to the mass ratio for second-stage compounding. The speed is 15-25 rpm and the air pressure is 0.4-0.5 MPa. The top bolt is raised and lowered twice between 40 and 90 seconds. The compound is discharged after 180-190 seconds. The discharge temperature is 100-105℃. The discharged compound is placed in the open mill with a thickness of 2 mm. The compound is wrapped around the roller and cut 3 / 4 of the way to the left and right three times. The sheet is cooled to obtain the corrugated protective layer compound.

[0015] In step (1), the grinding media of the sand mill is one of ceramic balls, carbon steel balls, stainless steel balls, high chromium cast iron balls, or corundum balls.

[0016] This invention provides a corrugated protective layer rubber for civil aviation radial tires and its preparation method. The corrugated protective layer rubber uses No. 1 smoked sheet rubber as the raw rubber system, with polyisoprene as the main component. Polyisoprene is an unsaturated rubber that is easy to blend, process, and vulcanize. The vulcanized rubber can crystallize in an oriented manner under stress, producing a self-reinforcing effect and exhibiting good mechanical properties, with a tensile strength reaching up to 30 MPa. Simultaneously, natural rubber possesses good tear resistance, damage resistance, durability, and flexural strength, making it a preferred rubber matrix material for preparing high-performance civil aviation radial tires. N330 carbon black is used as the reinforcing system; it is a typical furnace black with a normal vulcanization rate and an average particle size range of 26–30 nm, exhibiting good wear resistance and reinforcing effects. N46 machine oil is used as the plasticizing system; it is a lubricating softener used for natural rubber and general-purpose synthetic rubbers, with good processing performance. Insoluble sulfur HDOT-20 is used as the vulcanizing agent. It is insoluble in rubber, but is uniformly dispersed in the compound. It does not spray onto the surface during cooling and storage of the rubber compound. After vulcanization, it imparts excellent physical and mechanical properties to the vulcanized rubber. The bonding system uses adhesives RS, C9 resin, and tackifying resin HT-M, providing good adhesion between the formulation and aramid cords.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The corrugated protective layer adhesive for civil aviation radial tires prepared by this invention has the characteristics of high adhesion, impact resistance, tear resistance, puncture resistance, low heat generation, fatigue resistance and easy processing, which improves the physical and mechanical properties of the adhesive, especially the adhesion performance with aramid cords.

[0019] 2. The main raw materials in the corrugated protective layer rubber for civil aviation radial tires prepared by this invention, namely No. 1 smoked sheet rubber, N330 carbon black, N46 engine oil and insoluble sulfur HDOT-20, have stable supply and low price, which reduces the production cost of civil aviation radial tires. Detailed Implementation

[0020] The present invention will be further described below with reference to the embodiments, but this is not intended to limit the present invention.

[0021] Examples 1-3

[0022] The protective layer rubber for the corrugated layer of civil aviation radial tires prepared in Examples 1-3 was obtained by multi-stage mixing in an internal mixer according to the following material and weight ratio (see Table 1). The specific preparation process is as follows:

[0023] (1) Preparation of resin mixture: C9 resin (particle size range of 0.1-5 mm) and tackifying resin HT-M (particle size range of 0.4-0.6 mm) are added to a sand mill in a mass ratio of 3 / 2 for fine grinding. Continuous grinding is used, the feed pressure is 1.8 MPa, the grinding media ceramic balls (particle size 5.0 mm) filling amount is 45%, and the grinding time is 20 min to obtain the resin mixture. The particle size of the resin mixture is 2-3 micrometers.

[0024] (2) Add the No. 1 smoked sheet rubber required by the formula to the internal mixer for plasticizing. The mixing speed is 40 rpm, the air pressure is 0.5-0.6 MPa, the rubber inlet temperature is 70℃, and the rubber outlet temperature is 165℃ to obtain plasticized rubber.

[0025] (3) The prepared plasticized rubber, zinc oxide, stearic acid, antioxidant RD, antioxidant 4020, adhesive RS, and resin mixture are added to a mixer in the mass ratio for a first stage of rubber mixing. The mixing speed is 40 rpm, the air pressure is 0.5-0.6 MPa, and the inlet temperature is 70℃. When the mixing reaches 40 seconds and the temperature is 65℃, add half of the required N330 carbon black. When the mixing reaches 90 seconds and the temperature is 95℃, add the required N46 machine oil. Continue mixing until 120 seconds and the temperature is 125℃. Add the remaining N330 carbon black, mix for 145 seconds and the temperature reaches 145℃, lift the top bolt, lower the top bolt after 155 seconds, continue mixing for 185 seconds and the temperature reaches 155℃, then reduce the mixing temperature in the internal mixer by liquid nitrogen spraying, stop cooling after 215 seconds, the temperature drops to 135℃, continue mixing for 300 seconds and discharge the rubber at a discharge temperature of 165℃, place the discharged rubber in the open mill, the rubber thickness is 2mm and wraps around the roller, cut the rubber 3 / 4 on each side 3 times, and cool the sheet for 15 hours to obtain a first-stage compound rubber.

[0026] (4) The first-stage compound, insoluble sulfur HDOT-20, anti-scorching agent CTP, accelerator DZ, and anti-reversion agent HVA-2 are added to the internal mixer according to the mass ratio for two-stage compounding. The speed is 20 rpm, the air pressure is 0.4-0.5 MPa, and the inlet temperature is 70℃. The top bolt is raised and lowered twice at the 40th and 90th seconds of the compounding. The compound is discharged after 180 seconds at a discharge temperature of 100℃. The discharged compound is placed in the open mill with a thickness of 2 mm. The compound is cut 3 / 4 of the way to the left and right three times each. The sheet is cooled to obtain the corrugated protective layer compound.

[0027] The physical properties of the corrugated protective layer adhesives prepared in Examples 1-3 are shown in Table 2.

[0028] Table 1. Amounts of each raw material (by mass) in the tire corrugation protective layer adhesive formulations of Examples 1-3 and Comparative Examples 1-5.

[0029] Raw material name Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 #1 Smoked Sheet Rubber 100 100 100 100 100 Zinc oxide 5 10 8 5 4 stearic acid 2 4 6 2 1 Anti-aging agent RD 1 2 1.5 1 1 Anti-aging agent 4020 1 2 1.3 1 1 N46 engine oil 3 5 4 3 3 Insoluble sulfur HDOT-20 3 5 4 3 3 Accelerator DZ 0.5 0.8 1.0 0.5 0.5 Anti-reversion agent HVA-2 0.5 0.8 1.0 0.5 0.5 CTP (Catalyst) 0.1 0.3 0.2 0.1 0.1 N330 30 40 50 30 30 Adhesive RS 1 3.5 5 1 0.5 Resin mixture 1 5 3 / 0.5 Gumaron / / / 1 /

[0030] Comparative Example 1

[0031] The formulation of the protective layer adhesive for the corrugated layer of civil aviation radial tires in Comparative Example 1 differs from that in Example 1 in that the same mass of coumarone resin is used to replace the resin mixture in Example 1. The other components and proportions in the formulation are the same as in Example 1, and the preparation process is the same as in Example 1. The physical property parameters of the prepared protective layer adhesive are shown in Table 2.

[0032] Comparative Example 2

[0033] The formulation of the protective layer adhesive for the corrugated layer of civil aviation radial tires in Comparative Example 2 differs from that in Example 1 in that the mass fractions of zinc oxide, stearic acid, adhesive RS, and resin mixture are different from those in Example 1. The other components and proportions in the formulation are the same as in Example 1, and the preparation process is the same as in Example 1. The physical property parameters of the prepared protective layer adhesive are shown in Table 2.

[0034] Comparative Example 3

[0035] 1. The formulation of the corrugated protective layer adhesive for civil aviation radial tires in Comparative Example 3 is the same as that in Example 2.

[0036] 2. The preparation of the resin mixture in step (1) is different from that in Example 2. Other preparation processes and parameters are the same as in Example 2. The physical properties of the protective layer adhesive obtained are shown in Table 2.

[0037] Step (1) Preparation of resin mixture: C9 resin and tackifying resin HT-M are mixed in a conventional manner at a mass ratio of 3 / 2 to obtain resin mixture. The particle size of the resin mixture is 0.1 to 5 mm. The rest of the process is the same as in Example 2.

[0038] Comparative Example 4

[0039] 1. The formulation of the corrugated protective layer adhesive for civil aviation radial tires in Comparative Example 4 is the same as that in Example 2.

[0040] 2. The mixing process of the compound in the preparation process is different from that in Example 2. The specific preparation method is as follows:

[0041] (1) Preparation of resin mixture: C9 resin (particle size range of 0.1-5 mm) and tackifying resin HT-M (particle size range of 0.4-0.6 mm) are added to a sand mill in a mass ratio of 3 / 2 for fine grinding. Continuous grinding is used, the feed pressure is 1.8 MPa, the grinding media ceramic balls (particle size 5.0 mm) are filled with 45%, and the grinding time is 20 min to obtain the resin mixture. The particle size of the resin mixture is 2-3 micrometers.

[0042] (2) Add the required No. 1 smoked sheet rubber to the internal mixer for plasticizing. The mixing speed is 40 rpm, the air pressure is 0.5~0.6 MPa, the rubber inlet temperature is 70℃, and the rubber outlet temperature is 165℃ to obtain plasticized rubber.

[0043] (3) Add the prepared plasticized rubber, zinc oxide, stearic acid, antioxidant RD, antioxidant 4020, adhesive RS, and resin mixture to the internal mixer in the mass ratio for a first-stage rubber mixing. The mixing speed is 40 rpm, the air pressure is 0.5-0.6 MPa, and the inlet temperature is 70℃. When the mixing reaches 40 seconds and the temperature is 65℃, add 1 / 2 of the required N330 carbon black. When the mixing reaches 90 seconds and the temperature is 95℃, add the required N46 machine oil. When the mixing reaches 120 seconds and the temperature is 125℃, add the remaining N330 carbon black. When the mixing reaches 145 seconds and the temperature is 145℃, lift the top bolt. After 155 seconds, lower the top bolt and continue mixing until 210 seconds to discharge the rubber at a discharge temperature of 165℃. Place the discharged rubber in the open mill with a thickness of 2 mm and wrap it around the roller. Cut the rubber 3 / 4 on each side 3 times. Cool the sheet for 15 hours to obtain a first-stage rubber compound.

[0044] (4) The prepared primary compound, insoluble sulfur HDOT-20, anti-scorching agent CTP, accelerator DZ, and anti-reversion agent HVA-2 were added to an internal mixer according to the mass ratio for secondary compounding. The mixing speed was 20 rpm, the air pressure was 0.4-0.5 MPa, and the inlet temperature was 70℃. The top bolt was raised and lowered twice at the 40th and 90th seconds of mixing, respectively. The mixture was discharged after 180 seconds at a discharge temperature of 100℃. The discharged rubber was placed in an open mill with a thickness of 2 mm and rolled onto rollers. The rubber was cut three times on each side (3 / 4 of the length). After cooling, the corrugated protective layer rubber was obtained. The physical property parameters of the prepared protective layer rubber are shown in Table 2.

[0045] Comparative Example 5

[0046] 1. The formulation of the corrugated protective layer adhesive for civil aviation radial tires in Comparative Example 5 is the same as that in Example 2.

[0047] 2. The mixing time and debinding temperature during the preparation process differ from those in Example 2. The specific preparation method is as follows:

[0048] (1) Preparation of resin mixture: C9 resin (particle size range of 0.1-5 mm) and tackifying resin HT-M (particle size range of 0.4-0.6 mm) are added to a sand mill in a mass ratio of 3 / 2 for fine grinding. Continuous grinding is used, the feed pressure is 1.8 MPa, the grinding media ceramic balls (particle size 5.0 mm) are filled with 45%, and the grinding time is 20 min to obtain the resin mixture. The particle size of the resin mixture is 2-3 micrometers.

[0049] (2) Add the required No. 1 smoked sheet rubber to the internal mixer for plasticizing. The mixing speed is 40 rpm, the air pressure is 0.5~0.6 MPa, the rubber inlet temperature is 60℃, and the rubber outlet temperature is 155℃ to obtain plasticized rubber.

[0050] (3) The prepared plasticized rubber, zinc oxide, stearic acid, antioxidant RD, antioxidant 4020, adhesive RS, and resin mixture are added to a mixer in the mass ratio for a first stage of rubber mixing. The mixing speed is 40 rpm, the air pressure is 0.5-0.6 MPa, and the inlet temperature is 60℃. When the mixing reaches 30 seconds and the temperature is 55℃, add half of the required N330 carbon black. When the mixing reaches 80 seconds and the temperature is 85℃, add the required N46 machine oil. When the mixing reaches 110 seconds and the temperature is 115℃, add the remaining... The remaining N330 carbon black was mixed for 135 seconds and the temperature reached 135℃. The top bolt was raised, and the top bolt was lowered after 145 seconds. Mixing continued until 175 seconds and the temperature reached 145℃. The mixing temperature in the internal mixer was reduced by liquid nitrogen spraying. Cooling was stopped after 205 seconds and the temperature was reduced to 125℃. Mixing continued until 290 seconds and the rubber was discharged at a temperature of 155℃. The discharged rubber was placed in an open mill with a thickness of 2mm and wrapped around the rollers. The rubber was cut 3 / 4 of the way to the left and 3 / 4 of the way to the right, and then cooled for 15 hours to obtain a first-stage compound.

[0051] (4) The prepared first-stage compound, insoluble sulfur HDOT-20, anti-scorching agent CTP, accelerator DZ, and anti-reversion agent HVA-2 are added to the internal mixer according to the mass ratio for two-stage compounding. The speed is 20 rpm, the air pressure is 0.4-0.5 MPa, and the inlet temperature is 60℃. The top bolt is raised and lowered twice at the 30th and 80th seconds of the compounding, and the compound is discharged at 170 seconds with a discharge temperature of 90℃. The discharged compound is placed in the open mill with a thickness of 2 mm and wrapped around the roller. The compound is cut 3 / 4 of the way to the left and right three times each. The sheet is cooled to obtain the corrugated protective layer compound. The physical property parameters of the prepared protective layer compound are shown in Table 2.

[0052] The physical properties of the rubber compounds prepared in Examples 1-3 and Comparative Examples 1-5 were tested, and the results are shown in Table 2.

[0053] Table 2 Physical properties of the rubber compounds obtained in Examples 1-3 and Comparative Examples 1-5

[0054] Experimental Project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Tensile strength, MPa 25.0 26.3 24.6 20.9 20.5 21.1 18.1 17.3 300% constant tensile stress, MPa 11.3 11.6 11.2 10.1 9.8 9.2 8.0 9.9 Elongation at break, % 492 506 482 454 467 432 428 436 Hardness, Shore A 70 74 75 70 69 73 74 74 Permanent deformation, % 34 32 30 35 35 33 31 33 <![CDATA[Specific gravity, g / cm 3 > 1.125 1.128 1.135 1.125 1.125 1.128 1.128 1.128 Compression generates heat, ℃ 23.1 23.8 27.0 41.2 42.5 43.0 44.5 43.3 H is extracted, N is extracted. 210.3 227.6 223.2 89.6 90.2 70.4 132.6 150.3

[0055] As shown in the table above, compared with Example 1, Comparative Example 1 uses the same mass of coumarone resin to replace the resin mixture in Example 1. The final rubber compound's H-extraction, tensile strength, 300% tensile stress, and elongation at break are all significantly reduced, while the heat generated during compression increases. The adhesive system of binder RS, C9 resin, and tackifying resin HT-M used in this application not only improves the adhesiveness of the rubber compound but also enhances the overall performance of the rubber compound through mutual promotion with other auxiliary materials. In Comparative Example 2, after adjusting the mass proportions of zinc oxide, stearic acid, binder RS, and resin mixture, the final rubber compound's tensile strength, 300% tensile stress, H-extraction, and elongation at break are all significantly reduced, while the heat generated during compression increases. Compared to Example 2, in Comparative Example 3, C9 resin and tackifying resin HT-M were conventionally mixed at a mass ratio of 3 / 2 to obtain a resin mixture. The test results showed that Example 2 exhibited improved H-extraction, tensile strength, 300% tensile stress, and elongation at break, while reducing heat generation during compression. This indicates that grinding C9 resin and HT-M at a mass ratio of 3 / 2 resulted in smaller particle sizes, making them easier to disperse uniformly in the rubber compound, less prone to agglomeration, and able to more tightly fill the gaps in the rubber compound, thus improving its performance. Compared to Example 2, Comparative Example 4 eliminated the liquid nitrogen spraying method during preparation. The test results showed that Example 2 also exhibited improved H-extraction, tensile strength, 300% tensile stress, and elongation at break, while reducing heat generation during compression. This indicates that adding liquid nitrogen spraying during the mixing process and lowering the mixing temperature in the internal mixer helps extend the mixing time, resulting in more thorough and uniform mixing, and ultimately improving the rubber compound's performance. Compared with Example 2, Comparative Example 5 had different mixing and discharge temperatures during the preparation process, resulting in a corresponding decrease in the overall performance of the final rubber compound. A reasonable discharge temperature can improve the performance of the rubber compound. In summary, compared with Comparative Examples 1-5, the H-extraction test values ​​of Examples 1-3 were significantly improved, and the tensile strength, 300% elongation stress, and elongation at break were also improved, while the heat generation was lower. This indicates that the present invention has better high adhesion, impact resistance, tear resistance, puncture resistance, low heat generation, and good fatigue resistance.

[0056] Tensile strength, 300% constant elongation stress, elongation at break, and permanent deformation were tested according to GB / T528-2009 "Test of Tensile Stress-Strain Properties of Vulcanized Rubber or Thermoplastic Rubber"; hardness was tested according to GB / T531.1-2008 "Test Method for Indentation Hardness of Vulcanized Rubber or Thermoplastic Rubber Part 1: Shore Hardness Tester Method (Shore Hardness)"; specific gravity was tested according to GB / T533-2008 "Determination of Density of Vulcanized Rubber or Thermoplastic Rubber"; heat generation during compression was tested according to GB / T1687.3-2016 "Determination of Temperature Rise and Fatigue Resistance of Vulcanized Rubber in Flexural Test Part 3: Compression Flexural Test (Constant Stress Deformation)"; H-extraction was tested according to GB / T2942-2009 "Determination of Static Bond Strength between Vulcanized Rubber and Fiber Cord - H-Extraction Method".

[0057] Table 3. Manufacturers' brands of raw materials used in Examples 1-3 and Comparative Examples 1-5

[0058] raw material factory #1 Smoked Sheet Rubber Indonesia Zinc oxide Dalian Zinc Oxide Plant stearic acid Wilmar Oils & Fats Technology Co., Ltd. Anti-aging agent RD Comay Chemical Co., Ltd. Anti-aging agent 4020 Saint-Austen Chemical Technology Co., Ltd. N46 engine oil Shenyang Tianhong Lubricating Oil Co., Ltd. Insoluble sulfur HDOT-20 Shandong Shangshun Chemical Co., Ltd. Accelerator DZ Comay Chemical Co., Ltd. Anti-reversion agent HVA-2 Zhejiang Huangyan Zhedong Rubber Additives Co., Ltd. CTP (Catalyst) Haicheng Haiteng Additives Co., Ltd. N330 Carbon Black Anshan Jianlong Carbon Black Co., Ltd. Adhesive RS Wuxi Huasheng Rubber New Material Technology Co., Ltd. C9 resin Shandong Qilong Chemical Co., Ltd. Tackifying resin HT-M Shandong Yanggu Huatai Chemical Co., Ltd. Gumaron Anshan Yihua Chemical Co., Ltd.

Claims

1. A method for preparing a corrugated protective layer adhesive for civil aviation radial tires, characterized in that, The protective layer adhesive is made from raw materials in the following proportions by weight, as follows: 100 parts of No. 1 smoked sheet rubber, 5-10 parts of zinc oxide, 2-6 parts of stearic acid, 1.0-2.0 parts of antioxidant RD, 1-3 parts of antioxidant 4020, 3-5 parts of N46 machine oil, 3-5 parts of insoluble sulfur HDOT-20, 0.5-1.0 parts of accelerator DZ, 0.2-1.0 parts of anti-reversion agent HVA-2, 0.1-0.5 parts of anti-scorching agent CTP, 30-50 parts of N330 carbon black, 1-5 parts of adhesive RS, and 1-5 parts of resin mixture; The resin mixture is prepared by adding C9 resin and tackifying resin HT-M in a sand mill at a mass ratio of 3:2 and then refining and grinding them. The particle size of the resin mixture is 2 to 3 micrometers. The preparation method of this corrugated protective layer adhesive is as follows: (1) Preparation of resin mixture: C9 resin and tackifying resin HT-M are added to a sand mill in a mass ratio and ground continuously. The feed pressure is 1.4 MPa to 1.9 MPa, the grinding media filling amount is 35% to 55%, and the grinding time is 10 to 30 min to obtain a resin mixture with a particle size of 2 to 3 micrometers. (2) The No. 1 smoked sheet rubber is plasticized in an internal mixer at a speed of 30-50 rpm, an air pressure of 0.5-0.6 MPa, and a discharge temperature of 160-170℃ to obtain plasticized rubber. (3) The prepared plasticized rubber, zinc oxide, stearic acid, antioxidant RD, antioxidant 4020, adhesive RS, and resin mixture are added to a Banbury mixer according to the mass ratio for a first-stage rubber mixing process. The mixing speed is 30-50 rpm, and the air pressure is 0.5-0.6 rpm. When the pressure is 1 MPa and the mixture is kneaded for 35-45 seconds at a temperature of 60-65°C, add 1 / 3-2 / 3 of the required amount of N330 carbon black. Continue kneading for 85-95 seconds at a temperature of 90-95°C, then add N46 machine oil. Continue kneading for 115-125 seconds at a temperature of 120-125°C, then add the remaining N330 carbon black. Knead for 145-155 seconds at a temperature of 140-145°C, then raise and lower the top bolt once. Knead for 185-215 seconds at a temperature of 150-155°C, then reduce the kneading temperature in the internal mixer to 130-135°C using liquid nitrogen spray. Continue kneading for 275-300 seconds, then discharge the rubber at a temperature of 160-165°C. Place the discharged rubber compound in an open mill with a thickness of 2 mm, wrap it around the rollers, and cut it three times on each side (3 / 4 of the length). Cool the sheet for 8-24 seconds. h, to obtain a compound rubber; (4) Add the first-stage compound rubber, insoluble sulfur HDOT-20, anti-scorching agent CTP, accelerator DZ, and anti-reversion agent HVA-2 to the internal mixer according to the mass ratio for two-stage rubber mixing. The speed is 15-25 rpm, the air pressure is 0.4-0.5 MPa, and the top bolt is raised and lowered twice between 40 and 90 seconds. After mixing for 180-190 seconds, the rubber is discharged at a discharge temperature of 100-105℃. The discharged rubber is placed in the open mill with a rubber thickness of 2 mm. The rubber is cut 3 / 4 of the way to the left and right three times each. The sheet is cooled to obtain the corrugated protective layer rubber.

2. The method for preparing the corrugated protective layer adhesive for civil aviation radial tires according to claim 1, characterized in that, In step (1), the grinding media of the sand mill are ceramic balls, carbon steel balls, stainless steel balls, high chromium cast iron balls, or corundum balls.

3. A protective layer adhesive for the corrugated layer of civil aviation radial tires prepared by the preparation method according to claim 1 or 2.