CN109942910B - Aviation sidewall rubber with long flexing fatigue life, and preparation method and application thereof - Google Patents
Aviation sidewall rubber with long flexing fatigue life, and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to a formula of aviation sidewall rubber with a long flexing fatigue life, in particular to application of aviation sidewall rubber containing trans-1, 4-butadiene-isoprene copolymer rubber and a preparation method thereof. The sidewall rubber comprises the following substances in parts by weight: the rubber composition is prepared from trans-1, 4-butadiene-isoprene copolymer rubber TBIR 5-30 parts, natural rubber NR 50-85 parts, butadiene rubber BR 10-20 parts, carbon black 0-80 parts, silicon dioxide 0-30 parts, silane coupling agent Si 690-5 parts, plasticizer 0-10 parts, anti-scorching agent 0-0.8 part, sulfur 0.5-3 parts, accelerator 0.3-5 parts and other auxiliary agents by adopting a three-stage banburying and open mixing process. The green strength of the sidewall rubber compound is more than 3MPa, the vulcanized rubber has 300 percent stress at definite elongation which is more than 18MPa, and the number of times of 6-level flex crack resistance is more than 8 ten thousand.
Description
Technical Field
The invention belongs to the technical field of rubber, and particularly relates to aviation sidewall rubber with a long flex fatigue life, and a preparation method and application thereof.
Background
The sidewall rubber is the portion of the tire that undergoes extremely frequent flex deformation and should have excellent flex crack resistance. When the aircraft tire is used, the tire tread is easy to wear after being lifted and landed for many times, and the common treatment mode is to perform retreading. When retreading, when newly-fitted tread rubber undergoes a vulcanization process, the original sidewall rubber is subjected to the action of high temperature and high pressure again, and is easy to age. Therefore, the side rubber should have good aging resistance and vulcanization flatness. Retreaded tires are a great challenge for sidewall rubbers, which are required to maintain their performance after undergoing multiple cures.
At present, most of aviation tire sidewall rubber systems are natural rubber or a system combining natural rubber and butadiene rubber or styrene-butadiene rubber, and high-structure and high-wear-resistance N339 carbon black, paraffin, protective wax RP-3, p-phenylenediamine anti-aging agents, sulfur, sulfenamide accelerators DZ and other components are added, but the problems of poor solar radiation aging resistance and poor cracking resistance exist. The Chinese patent application CN 104844850A discloses that the solar radiation performance of an aviation air-resistant sidewall rubber is improved by adding an ultraviolet absorber and a crack preventing agent, but the butadiene rubber has the defects of poor processability, low strength, poor aging resistance and the like, and needs a large amount of carbon black for reinforcement. The Chinese invention patent CN 106496657A discloses an aviation sidewall rubber adopting gutta-percha, compared with BR, the gutta-percha is easy to crystallize, the tearing, aging and fatigue properties are improved after being blended with NR, the flex resistance is improved, but the stress at definite elongation is low, and particularly the stress at 300% definite elongation is only about 13 MPa.
Therefore, it is urgently needed to develop a sidewall rubber with good fatigue resistance, high stress at definite elongation and good aging resistance.
Disclosure of Invention
The invention aims to provide aviation sidewall rubber with a long flexion fatigue life, a preparation method and application thereof.
The invention provides an aviation sidewall rubber with a long flexing fatigue life, which adopts trans-1, 4-butadiene-isoprene copolymer rubber TBIR, natural rubber NR and butadiene rubber BR as base rubber, and the formula of the rubber compound comprises the following components in parts by weight:
5-30 parts of trans-1, 4-butadiene-isoprene copolymer rubber TBIR;
50-85 parts of natural rubber NR;
10-20 parts of butadiene rubber BR;
0-80 parts of carbon black;
0-30 parts of white carbon black;
690-12 parts of a silane coupling agent Si;
1-5 parts of zinc oxide;
1-5 parts of stearic acid;
0-10 parts of a plasticizer;
1-5 parts of an anti-aging agent;
0-0.8 part of a scorch retarder;
0.5-3 parts of sulfur;
0.3-5 parts of an accelerator;
0.5-5 parts of an anti-reversion agent;
the green strength of the sidewall rubber compound is more than 3 MPa; the 300% stress at definite elongation of the vulcanized rubber is more than 18MPa, and the number of times of 6-grade flexing-resistant cracks is more than 8 ten thousand.
Preferably, the trans-1, 4-butadiene-isoprene copolymer rubber TBIR contains 10-30 mol% of butadiene unit, more than 95 mol% of trans-1, 4-structure, 20-120 ten thousand of weight average molecular weight and 6-20 of molecular weight distribution.
Preferably, the carbon black is one or more of N220, N234, N330, N375, N339, N650 and N660;
the white carbon black is fumed silica and/or precipitated silica, the dibutyl phthalate absorption amount is 125-240 ml/100g, and the specific surface area tested by a CTAB method is 130-280 m2/g；
The accelerator is one or more of accelerator M, accelerator DM, accelerator TT, accelerator CZ, accelerator NOBS, accelerator NS, accelerator D, accelerator MBTS, accelerator ZDMC, accelerator H and accelerator NA;
the anti-aging agent is one or more of anti-aging agent RD, anti-aging agent D, anti-aging agent 4010NA, anti-aging agent H, anti-aging agent DPD, anti-aging agent 264 and anti-aging agent MB.
Preferably, the plasticizer is one or more of liquid paraffin, naphthenic oil, aromatic oil, environment-friendly aromatic oil, coal tar, coumarone resin, pine tar, rosin and asphalt;
the scorch retarder is one or more than two of N-cyclohexyl thiophthalimide, N-chloroform-thio-4-hexene-dicarboximide, zinc alkyl dithiophosphate, N-cyclohexyl thiophthalimide, N-nitrosodiphenylamine and benzenesulfonamide derivatives;
the anti-reversion agent is one or more than two of SVA-2, PK900, HTS, HV-268, HVA-2 and Z311 which are used in a compounding way.
The invention provides a preparation method of the aviation sidewall rubber with the high flex fatigue life, which is characterized by comprising the following steps:
first-stage banburying:
1) adding all the rubber into an internal mixer, wherein the internal mixing temperature is 65-75 ℃, the internal mixing speed is 65-75 rpm, and the internal mixing is carried out for 1-5 min;
2) putting zinc oxide, stearic acid, an anti-aging agent, an anti-scorching agent and a plasticizer into an internal mixer, and banburying for 1-10 min;
3) adding 1/3-2/3 carbon black, white carbon black and all coupling agents into an internal mixer, and internally mixing for 1-30 min; then adding all the residual carbon black and white carbon black, uniformly mixing, discharging rubber at 135-165 ℃ to obtain a section of rubber compound, and placing the rubber compound in an oven at 60-80 ℃ for 5-15 min;
two-stage banburying:
4) adding the first-stage rubber compound obtained in the step 3) into an internal mixer, controlling the internal mixing temperature to be 65-75 ℃, the internal mixing speed to be 65-75 rpm and the second-stage internal mixing time to be 5-8 min during internal mixing to obtain second-stage rubber compound, and placing the second-stage rubber compound in an oven at the temperature of 60-80 ℃ for 5-15 min;
three-stage banburying:
5) adding 1/2-2/3 of the two-stage rubber compound obtained in the step 4) into an internal mixer, controlling the internal mixing temperature to be 50-70 ℃ and the internal mixing speed to be 25-35 rpm, adding sulfur, an accelerator and an anti-vulcanization reversion agent, and the rest of the two-stage rubber compound, controlling the three-stage internal mixing time to be 2-12 min, and controlling the rubber discharge temperature to be less than 75 ℃ to discharge rubber to obtain a three-stage rubber compound;
open mixing:
6) the three sections of rubber compounds obtained in the step 5) are milled on a mill, the temperature of front and rear rollers of the mill is 50-60 ℃, the speed of the front roller is 20-35 rpm, the speed of the rear roller is 15-25 rpm, the roller distance is adjusted to be 2mm, the rubber compounds are passed for 2-6 times, then a triangular bag is opened for 6 times with the roller distance of 0.2mm, the roller distance is adjusted to be 1mm, the rubber compounds are twisted for 2-6 times, finally the roller distance is adjusted to be 1.8mm, and pieces are milled to obtain the rubber compounds;
7) standing the mixed rubber obtained in the step 6) at the temperature of 23 +/-0.1 ℃ for 24-72 hours;
and (3) vulcanization:
8) vulcanizing the rubber compound obtained in the step 7), wherein the vulcanization temperature is 130-175 ℃, the vulcanization pressure is 10-20 MPa, the vulcanization time is the positive vulcanization time for the vulcanization characteristic test at the corresponding temperature, and the vulcanized rubber is placed at room temperature for 12 hours and then tested.
Preferably, the green strength of the mix is greater than 4.5 MPa.
Preferably, the 300% stress at definite elongation of the vulcanized rubber is more than 18.5MPa, and the number of times of 6-grade flexing resistance cracks is more than 8.5 ten thousand.
The invention provides an application of high-flex fatigue life aviation sidewall rubber in an aviation tire, wherein the high-flex fatigue life aviation sidewall rubber is the high-flex fatigue life aviation sidewall rubber or the high-flex fatigue life aviation sidewall rubber obtained by the preparation method, and vulcanized rubber of the high-flex fatigue life aviation sidewall rubber has high stress at definite elongation and flex fatigue life, so that the service life of the sidewall rubber is prolonged.
Preferably, the number of times of bending-resistant 6-level cracks tested after the rubber compound is vulcanized for 2-5 times of positive vulcanization time is more than 8 ten thousand, the number of times of bending-resistant 6-level cracks tested after the rubber compound is aged for 24-72 hours at 100 ℃ is more than 8 ten thousand, and the number of times of retreading the sidewall rubber of the aviation tire is increased by more than 30%.
The mixed rubber obtained by the preparation method has certain crystallinity due to TBIR, and the Green strength of the obtained mixed rubber is more than 3 MPa. After vulcanization, the vulcanized rubber has a 300% stress at definite elongation of more than 18MPa and a 6-grade flex crack resistance of more than 8 ten thousand times. Particularly, the number of times of flexing-resistant 6-level cracks tested after vulcanized rubber is vulcanized for 2-5 times of positive vulcanization time is more than 8 ten thousand, the number of times of flexing-resistant 6-level cracks tested after 100 ℃ thermal oxidation aging is 24-72 hours is more than 8 ten thousand, and the number of times of retreading the side rubber of the aviation tire is improved by 30-50%.
The high-flex fatigue life aviation tire sidewall rubber disclosed by the invention is used for a high-flex fatigue life aviation tire sidewall, has high stress at definite elongation and a flex fatigue life, and prolongs the service life of the sidewall rubber.
Detailed Description
The invention provides an aviation sidewall rubber with a long flexing fatigue life, which adopts trans-1, 4-butadiene-isoprene copolymer rubber TBIR, natural rubber NR and butadiene rubber BR as base rubber, and the formula of the rubber compound comprises the following components in parts by weight:
5-30 parts of trans-1, 4-butadiene-isoprene copolymer rubber TBIR;
50-85 parts of natural rubber NR;
10-20 parts of butadiene rubber BR;
0-80 parts of carbon black;
0-30 parts of white carbon black;
690-12 parts of a silane coupling agent Si;
1-5 parts of zinc oxide;
1-5 parts of stearic acid;
0-10 parts of a plasticizer;
1-5 parts of an anti-aging agent;
0-0.8 part of a scorch retarder;
0.5-3 parts of sulfur;
0.3-5 parts of accelerator
0.5-5 parts of an anti-reversion agent;
the green strength of the sidewall rubber compound is more than 3 MPa; the 300% stress at definite elongation of the vulcanized rubber is more than 18MPa, and the number of times of 6-grade flexing-resistant cracks is more than 8 ten thousand.
In the present invention, the trans-1, 4-butadiene-isoprene copolymer rubber (TBIR) had a butadiene content of 19.8 mol% and a trans-1, 4-structure content>95 mol%, Mooney viscosity ML3+4 100℃60.5, a weight average molecular weight of 540000g/mol, a molecular weight distribution index of 3.09, supplied by Shandong Hua Polymer materials, Ltd. The trans-1, 4-butadiene-isoprene copolymer rubber TBIR comprises, by weight, 5-30 parts, preferably 10-20 parts.
The Natural Rubber (NR), the brand SCR WF, ML3+4 100℃95.0, provided by gold water processing factory of China sea rubber group; the weight part of the natural rubber NR is 50-85 parts, preferably 60-80 parts.
The cis-Butadiene Rubber (BR) is of the brand BR9000, ML3+4 100℃42.0, provided by the well-petrochemical, zilu division; the weight portion of the butadiene rubber is 10-20, preferably 10-15;
the weight part of the carbon black is 0-80 parts, preferably 20-60 parts, and more preferably 40-60 parts; the silane coupling agent Si69 is 0-12 parts by weight, preferably 5-8 parts by weight; the weight part of the zinc oxide is 1-5 parts, preferably 3-5 parts; the stearic acid accounts for 1-5 parts by weight, preferably 2-4 parts by weight, and most preferably 2.5-3 parts by weight; the weight part of the plasticizer is 0-10 parts, preferably 3-8 parts, and more preferably 4-6 parts; the specific composition of the anti-aging agent is preferably a compound of an anti-aging agent RD and an anti-aging agent 4020 in a mass ratio of 2: 3; the anti-aging agent is 1-5 parts by weight, and more preferably 3-5 parts by weight; the weight part of the anti-scorching agent is 0-0.8, preferably 0.2-0.6; the accelerator is 0.3-5 parts by weight, preferably 1-4 parts by weight, and more preferably 2-3 parts by weight; the weight portion of the anti-reversion agent is 0.5-5 portions, preferably 1-4 portions, and more preferably 1-3 portions.
For further illustration of the present invention, the following examples are provided to describe the high flex fatigue life aviation sidewall rubber, its preparation method and application in detail, but should not be construed as limiting the scope of the present invention.
The green strength of the mixes was tested on dumbbell specimens based on ISO standard 9026-2007 at 23 ℃; testing the crosslinking density of the vulcanized rubber by using a nuclear magnetic resonance crosslinking density tester; and (3) testing the vulcanization characteristic at 130 ℃ for 45min based on the national standard GB/T16584-1996, and determining the positive vulcanization time of the process.
Based on the national standard GB/T528-; stress at definite elongation (MPa) was measured at 100% and 300% elongation; testing the room temperature rebound of the vulcanized rubber at 23 ℃ based on the national standard GB/T1681-; testing the flex fatigue resistance of the vulcanized rubber at 23 ℃ based on the national standard GB/T13934-; testing the heat generation performance of the sample under the conditions that the temperature is 55 +/-1 ℃, the stroke is 4.45 +/-0.03 mm and the load is 1.00 +/-0.03 MPa; carrying out hot air aging test based on the national standard GB/T3512-2001, calculating the aging coefficient and the aging condition: and (3) multiplying the temperature by 48h at 100 ℃, and testing the flex fatigue resistance of the aged sample.
In the examples, the specific embodiments are as follows, in parts by weight:
example 1
10 parts of trans-1, 4-butadiene-isoprene copolymer rubber TBIR; NR 80 parts of natural rubber; 10 parts of butadiene rubber BR; carbon black N23460 parts; 10 parts of white carbon black; silane coupling agent Si 698 parts; 5 parts of zinc oxide; 2.5 parts of stearic acid; 6 parts of plasticizer environment-friendly aromatic oil; 2 parts of an anti-aging agent RD; 40203 parts of an anti-aging agent; 0.2 part of scorch retarder N-cyclohexyl thiophthalimide; 1.8 parts of insoluble sulfur; 2 parts of an accelerator CZ; 21 parts of an anti-reversion agent SVA.
Natural Rubber (NR), SCR WF, ML3+4100 ℃95.0, china marine glue group gold water processing plant; butadiene Rubber (BR), brand BR9000, ML3+4100 ℃ ═ 42.0, sterle division, medium petrochemicals; trans-1, 4-butadiene-isoprene copolymer rubber (TBIR), butadiene content 19.8 mol%, trans-1, 4-structure content >95 mol%, mooney viscosity ML3+4100 ℃ > 60.5, weight average molecular weight 540,000g/mol, molecular weight distribution index 3.09, santochua polymer materials ltd.
The vulcanized rubber is prepared by the following process according to the formula:
first-stage banburying:
1) adding all the rubber into an internal mixer, wherein the internal mixing temperature is 65 ℃, the internal mixing speed is 75rpm, and the internal mixing is carried out for 1 min;
2) putting zinc oxide, stearic acid, anti-aging agent, scorch retarder and plasticizer into an internal mixer, and banburying for 1 min;
3) adding the 2/3 carbon black, white carbon black and all coupling agents into an internal mixer, and internally mixing for 10 min; then adding the rest of all carbon black and white carbon black, banburying for 5min, after uniformly mixing, discharging rubber at 135 ℃ to obtain a section of rubber compound, and placing the rubber compound in an oven at 60 ℃ for 5 min;
two-stage banburying:
4) adding the first-stage rubber compound obtained in the step 3) into an internal mixer, controlling the internal mixing temperature to be 65 ℃, the internal mixing speed to be 75rpm and the second-stage internal mixing time to be 5min during internal mixing to obtain second-stage rubber compound, and placing the second-stage rubber compound into a 60 ℃ oven for 5 min;
three-stage banburying:
5) adding 2/3 of the two-stage rubber compound obtained in the step 4) into an internal mixer, controlling the internal mixing temperature to be 50 ℃ and the internal mixing speed to be 25rpm during internal mixing, adding sulfur, an accelerator and an anti-vulcanization reversion agent, and the rest of the two-stage rubber compound, controlling the rubber discharge temperature to be less than 75 ℃ and discharging rubber for 6min in three-stage internal mixing to obtain three-stage rubber compound;
open mixing:
6) and (3) milling the three-section rubber compound obtained in the step 5) on a mill, wherein the temperature of front and rear rollers of the mill is 50 ℃, the speed of the front roller is 20rpm, the speed of the rear roller is 15rpm, the roller spacing is adjusted to be 2mm, the roller is passed for 6 times, then a triangular bag is formed for 6 times by adjusting the roller spacing to be 0.2mm, the roller spacing is adjusted to be 1mm, the rubber is twisted for 6 times, finally the roller spacing is adjusted to be 1.8mm, and the sheet is discharged after milling.
7) Standing the mixed rubber obtained in the step 6) at the temperature of 23 +/-0.1 ℃ for 24 hours;
and (3) vulcanization:
8) vulcanizing the rubber compound obtained in the step 7), wherein the vulcanization temperature is 130 ℃, the vulcanization pressure is 10MPa, the vulcanization time is the positive vulcanization time of the vulcanization characteristic test at 130 ℃, and the vulcanized sample is placed at room temperature for 12h and then tested. The mechanical properties obtained are shown in Table 1.
Example 2
The same as example 1 except that the BR portion is 0 and the TBIR portion is 20. The mechanical properties obtained are shown in Table 1.
Example 3
The same as example 1 except that the vulcanization time was 5 times the positive vulcanization time of the vulcanization characteristic test at 130 ℃. The mechanical properties obtained are shown in Table 1.
Comparative example 1
NR 80 parts of natural rubber; 20 parts of butadiene rubber BR; carbon black N23460 parts; 10 parts of white carbon black; silane coupling agent Si 698 parts; 5 parts of zinc oxide; 2.5 parts of stearic acid; 6 parts of plasticizer environment-friendly aromatic oil; 2 parts of an anti-aging agent RD; 40203 parts of an anti-aging agent; 0.2 part of scorch retarder N-cyclohexyl thiophthalimide; 1.8 parts of insoluble sulfur; 2 parts of an accelerator CZ; 21 parts of an anti-reversion agent SVA.
Natural Rubber (NR), SCR WF, ML3+4100 ℃95.0, china marine glue group gold water processing plant; cis-Butadiene Rubber (BR), trade mark BR9000, ML3+4100 ℃ ═ 42.0, sterle division, medium petro-chemical.
The processing and vulcanization process was the same as in example 1. The mechanical properties obtained are shown in Table 1.
As can be seen from Table 1, after the TBIR is used together, other properties are basically maintained, the Green strength of the rubber compound is greatly improved by about 6-10 times, and the processing stiffness is favorably improved. The flex fatigue resistance of the vulcanized rubber is improved, particularly after the vulcanized rubber is vulcanized for 5 times of process positive vulcanization time, the fatigue resistance can still be maintained for more than 8 ten thousand times, and the excellent crack initiation resistance is particularly embodied, and is improved by more than 30 percent, namely the retreading frequency of the tire is improved by more than 30 percent.
TABLE 1 Properties of examples and comparative examples
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The aviation sidewall rubber with the long flexing fatigue life is characterized in that the sidewall rubber adopts trans-1, 4-butadiene-isoprene copolymer rubber TBIR, natural rubber NR and butadiene rubber BR as base rubber, and the formula of a rubber compound comprises the following components in parts by weight:
5-30 parts of trans-1, 4-butadiene-isoprene copolymer rubber TBIR;
the content of butadiene units in the trans-1, 4-butadiene-isoprene copolymer rubber TBIR is 19.8mol percent, and the content of trans-1, 4-structures in the rubber is>95 mol%, Mooney viscosity ML3+4 100℃= 60.5, weight average molecular weight 540000g/mol, molecular weight distribution index 3.09;
50-85 parts of natural rubber NR;
10-20 parts of butadiene rubber BR;
0-80 parts of carbon black;
10-30 parts of white carbon black;
silane coupling agent Si 695-8 parts;
1-5 parts of zinc oxide;
1-5 parts of stearic acid;
4-6 parts of plasticizer environment-friendly aromatic oil;
1-5 parts of an anti-aging agent;
0.2-0.6 part of scorch retarder N-cyclohexyl thiophthalimide;
0.5-3 parts of sulfur;
0.3-5 parts of an accelerator;
21-3 parts of an anti-reversion agent SVA-21;
the green strength of the sidewall rubber compound is more than 3 MPa; the 300% stress at definite elongation of the vulcanized rubber is more than 18MPa, and the number of times of 6-grade flexing-resistant cracks is more than 8 ten thousand.
2. The high flex fatigue life aircraft sidewall rubber of claim 1, wherein the carbon black is one or more of N220, N234, N330, N375, N339, N650, N660;
the white carbon black is fumed silica and/or precipitated silica, the dibutyl phthalate absorption amount is 125-240 ml/100g, and the specific surface area tested by a CTAB method is 130-280 m2/g；
The accelerator is one or more of accelerator M, accelerator DM, accelerator TT, accelerator CZ, accelerator NOBS, accelerator NS, accelerator D, accelerator ZDMC and accelerator H;
the anti-aging agent is one or more of anti-aging agent RD, anti-aging agent D, anti-aging agent 4010NA, anti-aging agent H, anti-aging agent DPD, anti-aging agent 264 and anti-aging agent MB.
3. The preparation method of the aviation sidewall rubber with the high flexural fatigue life, which is prepared by the following steps of:
first-stage banburying:
1) adding all the rubber into an internal mixer, wherein the internal mixing temperature is 65-75 ℃, the internal mixing speed is 65-75 rpm, and the internal mixing is carried out for 1-5 min;
2) putting zinc oxide, stearic acid, an anti-aging agent, an anti-scorching agent and a plasticizer into an internal mixer, and banburying for 1-10 min;
3) adding 1/3-2/3 carbon black, white carbon black and all coupling agents into an internal mixer, and internally mixing for 1-30 min; then adding all the residual carbon black and white carbon black, uniformly mixing, discharging rubber at 135-165 ℃ to obtain a section of rubber compound, and placing the rubber compound in an oven at 60-80 ℃ for 5-15 min;
two-stage banburying:
4) adding the first-stage rubber compound obtained in the step 3) into an internal mixer, controlling the internal mixing temperature to be 65-75 ℃, the internal mixing speed to be 65-75 rpm and the second-stage internal mixing time to be 5-8 min during internal mixing to obtain second-stage rubber compound, and placing the second-stage rubber compound in an oven at the temperature of 60-80 ℃ for 5-15 min;
three-stage banburying:
5) adding 1/2-2/3 of the two-stage rubber compound obtained in the step 4) into an internal mixer, controlling the internal mixing temperature to be 50-70 ℃ and the internal mixing speed to be 25-35 rpm, adding sulfur, an accelerator and an anti-vulcanization reversion agent and the rest of the two-stage rubber compound, controlling the three-stage internal mixing time to be 2-12 min, and controlling the rubber discharge temperature to be less than 75 ℃ to discharge rubber to obtain a three-stage rubber compound;
open mixing:
6) the three sections of rubber compounds obtained in the step 5) are milled on a mill, the temperature of front and rear rollers of the mill is 50-60 ℃, the speed of the front roller is 20-35 rpm, the speed of the rear roller is 15-25 rpm, the roller distance is adjusted to be 2mm, the rollers are passed for 2-6 times, then the roller distance is adjusted to be 0.2mm, triangular packages are packed for 6 times, the roller distance is adjusted to be 1mm, the rolls are twisted for 2-6 times, finally the roller distance is adjusted to be 1.8mm, and pieces are milled to obtain the rubber compounds;
7) standing the mixed rubber obtained in the step 6) at the temperature of 23 +/-0.1 ℃ for 24-72 hours;
and (3) vulcanization:
8) vulcanizing the rubber compound obtained in the step 7), wherein the vulcanization temperature is 130-175 ℃, the vulcanization pressure is 10-20 MPa, the vulcanization time is the positive vulcanization time for the vulcanization characteristic test at the corresponding temperature, and the vulcanized rubber is tested after standing at room temperature for 12 hours.
4. The high flex fatigue life aviation sidewall rubber prepared by the preparation method of claim 3, wherein the green strength of the rubber compound is greater than 4.5 MPa.
5. The aviation sidewall rubber with high flex fatigue life prepared by the preparation method of claim 3, wherein the 300% stress at definite elongation of the vulcanized rubber is more than 18.5MPa, and the number of flex-resistant 6-grade cracks is more than 8.5 ten thousand.
6. The application of the aviation sidewall rubber with high flex fatigue life in an aviation tire is characterized in that the aviation sidewall rubber with high flex fatigue life is the aviation sidewall rubber with high flex fatigue life in the claim 1 or the aviation sidewall rubber with high flex fatigue life obtained by the preparation method in the claim 3, and vulcanized rubber of the aviation sidewall rubber has high stress at definite elongation and flex fatigue life resistance and prolongs the service life of the sidewall rubber.
7. The side rubber compound prepared by the method according to claim 3, wherein the number of flex-resistance level 6 cracks tested after the compound is vulcanized for 2-5 times of process positive vulcanization time is more than 8 ten thousand, the number of flex-resistance level 6 cracks tested after 100 ℃ thermal-oxidative aging for 24-72 hours is more than 8 ten thousand, and the retreading frequency of the side rubber for aviation is improved by more than 30%.
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