CN111944214A - Aircraft tire tread rubber and preparation method and application thereof - Google Patents
Aircraft tire tread rubber and preparation method and application thereof Download PDFInfo
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- CN111944214A CN111944214A CN202010854999.1A CN202010854999A CN111944214A CN 111944214 A CN111944214 A CN 111944214A CN 202010854999 A CN202010854999 A CN 202010854999A CN 111944214 A CN111944214 A CN 111944214A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0016—Compositions of the tread
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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Abstract
The invention relates to the technical field of aircraft tires, in particular to an aircraft tire tread rubber and a preparation method and application thereof. The aircraft tire tread rubber comprises the following preparation raw materials in parts by mass: 88-92 parts of natural rubber, 46-50 parts of medium-ultra wear-resistant carbon black, 12-18 parts of white carbon black wet-process rubber, 2-3 parts of silane coupling agent, 1-2 parts of heat stabilizer, 0.5-1 part of anti-vulcanization reversion agent, 1-3 parts of multifunctional vulcanization activator, 1.5-2.0 parts of tear-resistant resin, 3-5 parts of zinc oxide, 2-5 parts of anti-aging agent, 2.1-2.3 parts of insoluble sulfur, 1.0-1.1 parts of accelerator and 1-2 parts of multi-walled carbon nano tube. The tread rubber disclosed by the invention has the advantages of low compression heat generation, high tearing strength, good cutting resistance, good wear resistance, good flex cracking resistance, good ozone aging resistance, good thermal stability, higher tensile strength and elongation at break and the like, and can be used for aircraft tires.
Description
Technical Field
The invention relates to the technical field of aircraft tires, in particular to an aircraft tire tread rubber and a preparation method and application thereof.
Background
The tread rubber is a layer of rubber material with patterns printed on the surface, wherein the outermost layer of the tire is in contact with the road surface. With the continuous improvement of the take-off and landing speed of novel airplanes, the performance requirements on tires are higher and higher. The aircraft tire takes off and lands at high speed under high load, and the tread rubber needs high tensile strength, tearing strength, low dynamic heat generation, good cutting resistance, good wear resistance, good flex crack resistance and good thermal stability, so that the use safety of the tire can be ensured. Due to the long storage time of the tire, good ozone aging resistance of the tread rubber is required. However, the conventional tread rubber has difficulty in satisfying the above performance requirements at the same time. Therefore, it is highly desirable to provide a tread rubber having low heat generation due to compression, high tear strength, good cut resistance, good wear resistance, good flex cracking resistance, good ozone aging resistance, good thermal stability, and high tensile strength and elongation at break.
Disclosure of Invention
The tread rubber has the advantages of low heat generation in compression, high tearing strength, good cutting resistance, good wear resistance, good flex cracking resistance, good ozone aging resistance, good thermal stability, higher tensile strength, higher elongation at break and the like, and can be used for aircraft tires.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides an aircraft tire tread rubber which comprises the following preparation raw materials in parts by mass: 88-92 parts of natural rubber, 46-50 parts of medium-ultra wear-resistant carbon black, 12-18 parts of white carbon black wet-process rubber, 2-3 parts of silane coupling agent, 1-2 parts of heat stabilizer, 0.5-1 part of anti-vulcanization reversion agent, 1-3 parts of multifunctional vulcanization activator, 1.5-2.0 parts of tear-resistant resin, 3-5 parts of zinc oxide, 2-5 parts of anti-aging agent, 2.1-2.3 parts of insoluble sulfur, 1.0-1.1 parts of accelerator and 1-2 parts of multi-walled carbon nanotube;
the tensile strength of the natural rubber is more than or equal to 25.0MPa, the elongation at break is more than or equal to 800%, the tear strength is more than or equal to 30KN/m, the heat generation of compression is less than or equal to 8 ℃, and the natural rubber cracks for more than or equal to 6 hours under the conditions that the ozone concentration is 100pphm, the temperature is 40 ℃ and the elongation is 25%.
Preferably, the natural rubber is high-end natural rubber eosin 1# made in Jiancheng limited company of Yunnan natural rubber industry group.
Preferably, the anti-aging agent comprises p-phenylenediamine anti-aging agent 4020 and ketoamine anti-aging agent S-RD; based on the mass parts of the natural rubber, the mass parts of the p-phenylenediamine anti-aging agent 4020 are 1-3; the mass portion of the ketoamine antioxidant S-RD is 1-2.
Preferably, the tensile strength of the white carbon black wet glue is more than or equal to 25.0MPa, the elongation at break is more than or equal to 400%, the 300% stress at definite elongation is more than or equal to 12.0MPa, and the dispersion degree of the carbon black is more than or equal to 6.5 grade.
Preferably, the white carbon black wet-process rubber is white carbon black wet-process rubber SF175-50 produced by Mengla county Manzhu rubber Co.
Preferably, the medium and super wear-resistant carbon black is medium and super wear-resistant carbon black N220;
the silane coupling agent is a silane coupling agent Si 69;
the heat stabilizer is a heat stabilizer HS-80;
the anti-reversion agent is an anti-reversion agent WK-901;
the multifunctional vulcanization activator is a multifunctional vulcanization activator ZNZB 746;
the tear-resistant resin is tear-resistant resin SL-6903;
the insoluble sulfur is insoluble sulfur HD OT 20;
the accelerator is sulfonamide accelerator NS or sulfonamide accelerator NOBS.
The invention provides a preparation method of an aircraft tire tread rubber, which comprises the following steps:
mixing plasticated rubber of natural rubber, adding a multi-wall carbon nano tube, a multifunctional vulcanization activator and a heat stabilizer for continuous mixing when the mixing temperature is increased to 90-95 ℃, adding medium-super wear-resistant carbon black, white carbon black wet glue and a silane coupling agent for continuous mixing when the mixing temperature is increased to 100-105 ℃ from 90-95 ℃, blanking the obtained mixture when the mixing temperature is increased to 140-145 ℃ from 100-105 ℃, cooling and standing to obtain a section of mixed rubber;
mixing the first-stage rubber compound, the tear-resistant resin, the zinc oxide and the anti-aging agent, when the mixing temperature is increased to 120-125 ℃, discharging the obtained mixture, cooling and standing to obtain a second-stage rubber compound;
and mixing the two-stage rubber compound, insoluble sulfur, an accelerator and an anti-vulcanization reversion agent, discharging the obtained mixture when the mixing temperature reaches 100-105 ℃, cooling and standing to obtain the aircraft tire tread rubber.
Preferably, each of said mixing is carried out in an internal mixer; each of the said underfeeding is carried out in a tablet press.
Preferably, the parking time is 16-24 hours independently.
The invention provides an application of the aircraft tire tread rubber in the scheme or the aircraft tire tread rubber prepared by the preparation method in the scheme in an aircraft tire.
The invention provides an aircraft tire tread rubber which comprises the following preparation raw materials in parts by mass: 88-92 parts of natural rubber, 46-50 parts of medium-ultra wear-resistant carbon black, 12-18 parts of white carbon black wet-process rubber, 2-3 parts of silane coupling agent, 1-2 parts of heat stabilizer, 0.5-1 part of anti-vulcanization reversion agent, 1-3 parts of multifunctional vulcanization activator, 1.5-2.0 parts of tear-resistant resin, 3-5 parts of zinc oxide, 2-5 parts of anti-aging agent, 2.1-2.3 parts of insoluble sulfur, 1.0-1.1 parts of accelerator and 1-2 parts of multi-walled carbon nanotube; the tensile strength of the natural rubber is more than or equal to 25.0MPa, the elongation at break is more than or equal to 800%, the tear strength is more than or equal to 30KN/m, the heat generation of compression is less than or equal to 8 ℃, and the natural rubber cracks for more than or equal to 6 hours under the conditions that the ozone concentration is 100pphm, the temperature is 40 ℃ and the elongation is 25%.
Natural rubber is a main component of the tread rubber, and the performance of the natural rubber directly influences the performance of the tread rubber. The natural rubber adopted by the invention has the performance characteristics of higher elasticity, low heat generation, high tensile strength, high tearing strength, high elongation at break and good ozone aging resistance, thereby being beneficial to improving the corresponding performance of the tread rubber; in the invention, the multiwalled carbon nanotube can improve the heat conduction and the electric conductivity of the rubber material and greatly improve the wear resistance of the tread rubber; when the super wear-resistant carbon black is used as a reinforcing agent, the wear resistance of the rubber material is good, and the cutting resistance is good; the wet-process white carbon black glue has lower heat generation and better wear resistance than common white carbon black; the silane coupling agent plays a role in bridging between the white carbon black and the natural rubber, so that the white carbon black in the white carbon black wet glue is well combined with the natural rubber, and the glue material has the performance characteristics of high tensile strength, high tearing strength, high stress at definite elongation, good wear resistance and low heat generation; the heat stabilizer and the anti-vulcanization reversion agent can ensure that vulcanized rubber has good thermal stability and anti-vulcanization reversion performance, so that rubber is not degraded or is rarely degraded when the tread rubber temperature is higher during the use of the tire, and the heat resistance of the tread rubber can be obviously improved; the multifunctional vulcanizing activator can make the rubber material have the characteristics of good anti-pricking performance and good processing performance. According to the invention, the prepared aircraft tire tread rubber has the performance characteristics of high tensile strength, high tear strength, low dynamic heat generation, good cutting resistance, good wear resistance, good thermal stability, good ozone aging resistance and good flex cracking resistance by controlling the dosage of each preparation raw material in the range and matching each component.
The properties of the aircraft tire tread rubber prepared by the invention are shown in table 1.
TABLE 1 aircraft tire Tread rubber Properties
Detailed Description
The invention provides an aircraft tire tread rubber which comprises the following preparation raw materials in parts by mass: 88-92 parts of natural rubber, 46-50 parts of medium-ultra wear-resistant carbon black, 12-18 parts of white carbon black wet-process rubber, 2-3 parts of silane coupling agent, 1-2 parts of heat stabilizer, 0.5-1 part of anti-vulcanization reversion agent, 1-3 parts of multifunctional vulcanization activator, 1.5-2.0 parts of tear-resistant resin, 3-5 parts of zinc oxide, 2-5 parts of anti-aging agent, 2.1-2.3 parts of insoluble sulfur, 1.0-1.1 parts of accelerator and 1-2 parts of multi-walled carbon nanotube;
the tensile strength of the natural rubber is more than or equal to 25.0MPa, the elongation at break is more than or equal to 800%, the tear strength is more than or equal to 30KN/m, the heat generation of compression is less than or equal to 8 ℃, and the natural rubber cracks for more than or equal to 6 hours under the conditions that the ozone concentration is 100pphm, the temperature is 40 ℃ and the elongation is 25%.
In the present invention, the starting materials used are all commercially available products well known in the art, unless otherwise specified.
The raw materials for preparing the aircraft tire tread rubber comprise 88-92 parts by mass of natural rubber, and in the embodiment of the invention, the raw materials comprise 88, 90 or 92 parts by mass of natural rubber. In the present invention, the natural rubber satisfies the performance parameters listed in table 2:
TABLE 2 Natural rubber Property parameters
In the present invention, the natural rubber is preferably domestic high-end natural rubber eosin 1# produced by Jiangcheng Limited, Yunnan Natural rubber industry group. Natural rubber is a main component of the tread rubber, and the performance of the natural rubber directly influences the performance of the tread rubber. The natural rubber adopted by the invention has the performance characteristics of higher elasticity, low heat generation, high tensile strength, high tearing strength, high elongation at break and good ozone aging resistance, thereby being beneficial to improving the corresponding performance of the tread rubber.
Based on the mass parts of the natural rubber, the preparation raw material of the aircraft tire tread rubber provided by the invention comprises 46-50 parts of medium-super wear-resistant carbon black, and in the embodiment of the invention, the preparation raw material is specifically 46 parts, 48 parts or 50 parts. In the invention, the medium and super wear-resistant carbon black is preferably medium and super wear-resistant carbon black N220. The invention takes the medium and super wear-resistant carbon black as the reinforcing agent, so that the tread rubber has good wear resistance and good cutting resistance.
Based on the mass parts of the natural rubber, the preparation raw material of the aircraft tire tread rubber provided by the invention comprises 12-18 parts of white carbon black wet-process rubber, preferably 13-17 parts, and more preferably 14-16 parts. In the examples of the present invention, it is specifically 12 parts, 15 parts or 18 parts. In the present invention, the white carbon black wet glue preferably satisfies the properties listed in table 3.
TABLE 3 Property parameters of the white carbon black wet-process pastes
| Product parameters | Product index | Inspection method |
| Tensile strength | ≥25.0MPa | GB/T528 |
| Elongation at break | ≥400％ | GB/T528 |
| Stress at definite elongation of 300% | ≥12.0MPa | GB/T528 |
| Degree of dispersion of carbon black | Grade not less than 6.5 | Carbon black dispersity tester |
In the invention, the white carbon black wet-process adhesive is preferably white carbon black wet-process adhesive SF175-50 produced by Menglan county Manzhu rubber GmbH. In the invention, the white carbon black wet-process rubber SF175-50 is pre-dispersed white carbon black master batch obtained by wet-process mixing, adding white carbon black into natural rubber latex, drying and other processes, and has lower heat generation, better wear resistance and higher strength than like products of dry-process mixing white carbon black.
Based on the mass parts of the natural rubber, the raw materials for preparing the aircraft tire tread rubber provided by the invention comprise 2-3 parts of silane coupling agent, specifically 2 parts or 3 parts in the embodiment of the invention. In the present invention, the silane coupling agent is preferably a silane coupling agent Si 69. In the invention, the silane coupling agent plays a role in bridging between the white carbon black and the natural rubber, so that the white carbon black in the white carbon black wet glue is well combined with the natural rubber, and the glue material has the performance characteristics of high tensile strength, high tearing strength, high stress at definite elongation, good wear resistance and low heat generation.
Based on the mass parts of the natural rubber, the raw materials for preparing the aircraft tire tread rubber provided by the invention comprise 1-2 parts of heat stabilizer, preferably 1.5 parts. In the invention, the heat stabilizer is preferably a heat stabilizer HS-80.
Based on the mass parts of the natural rubber, the raw materials for preparing the aircraft tire tread rubber provided by the invention comprise 0.5-1 part of the anti-reversion agent, specifically 0.5 part, 0.7 part or 1.0 part in the embodiment of the invention. In the invention, the anti-reversion agent is preferably an anti-reversion agent WK-901. In the invention, the heat stabilizer and the anti-vulcanization reversion agent can ensure that vulcanized rubber has good heat stability and anti-vulcanization reversion performance, so that rubber is not degraded or is less degraded when the tread rubber temperature is higher during the use of the tire, and the heat resistance of the tread rubber can be obviously improved.
Based on the mass parts of the natural rubber, the raw materials for preparing the aircraft tire tread rubber comprise 1-3 parts of multifunctional vulcanization activator, preferably 1.5-2.5 parts, and more preferably 2 parts. In the present invention, the multifunctional vulcanization activator is preferably a multifunctional vulcanization activator ZNZB 746. The multifunctional vulcanizing activator can lead the rubber material to have the characteristics of better anti-pricking performance and good processing performance.
By taking the mass parts of the natural rubber as a reference, the raw materials for preparing the aircraft tire tread rubber provided by the invention comprise 1.5-2.0 parts of tear-resistant resin; in the examples of the present invention, it is specifically 1.5 parts or 2.0 parts. In the present invention, the tear resistant resin is preferably a tear resistant resin SL-6903. In the invention, the tear-resistant resin can improve the tear resistance of the tread rubber.
The preparation raw material of the aircraft tire tread rubber provided by the invention comprises 3-5 parts, preferably 4-5 parts and more preferably 5 parts of zinc oxide by taking the mass parts of the natural rubber as a reference. In the present invention, the zinc oxide functions as a vulcanization activator.
The preparation raw material of the aircraft tire tread rubber provided by the invention comprises 2-5 parts of anti-aging agent, preferably 3-4 parts by mass based on the mass parts of the natural rubber. In the invention, the anti-aging agent preferably comprises p-phenylenediamine anti-aging agent 4020 and ketoamine anti-aging agent S-RD; based on the mass parts of the domestic natural rubber, the mass parts of the p-phenylenediamine anti-aging agent 4020 are 1-3; the mass portion of the ketoamine antioxidant S-RD is 1-2.
By taking the mass parts of the natural rubber as a reference, the preparation raw material of the tread rubber of the aircraft tire provided by the invention comprises 2.1-2.3 parts of insoluble sulfur; in the examples of the present invention, specifically, 2.1 or 2.3 parts. In the present invention, the insoluble sulfur is preferably insoluble sulfur HD OT 20. In the present invention, the insoluble sulfur functions as a vulcanizing agent.
By taking the mass parts of the natural rubber as a reference, the preparation raw material of the aircraft tire tread rubber provided by the invention comprises 1.0-1.1 parts of an accelerator; in the examples of the present invention, it is specifically 1.0 part or 1.1 parts. In the present invention, the accelerator is preferably a sulfenamide accelerator NS or a sulfenamide accelerator NOBS.
By taking the mass parts of the natural rubber as a reference, the raw materials for preparing the aircraft tire tread rubber provided by the invention comprise 1-2 parts of multi-walled carbon nanotubes; in the examples of the present invention, it is specifically 1 part or 2 parts. In the present invention, the multi-walled carbon nanotube is preferably multi-walled carbon nanotube GTR-300-02 produced by Shandong Dazhang nanomaterial Co. In the invention, the multi-walled carbon nanotube GTR-300-02 is prepared by a modified catalytic carbon gas phase precipitation method (CCVD), and has a high specific surface area (20-50 m)2The purity of carbon phase is high (the content is more than or equal to 98 percent), the distribution of outer diameter is narrow, and the length-diameter ratio (length: 3-12 μm, inner diameter: 12-15 nm), is used for rubber products, and has the performances of high electric conductivity, high heat conductivity and high wear resistance.
According to the invention, the prepared aircraft tire tread rubber has the performance characteristics of high tensile strength, high tear strength, low dynamic heat generation, good cutting resistance, good wear resistance, good thermal stability, good ozone aging resistance and good flex cracking resistance by controlling the dosage of each preparation raw material in the range and matching each component.
The invention provides a preparation method of an aircraft tire tread rubber, which comprises the following steps:
mixing plasticated rubber of natural rubber, adding a multi-wall carbon nano tube, a multifunctional vulcanization activator and a heat stabilizer for continuous mixing when the mixing temperature is increased to 90-95 ℃, adding medium-super wear-resistant carbon black, white carbon black wet glue and a silane coupling agent for continuous mixing when the mixing temperature is increased to 100-105 ℃ from 90-95 ℃, blanking the obtained mixture when the mixing temperature is increased to 140-145 ℃ from 100-105 ℃, cooling and standing to obtain a section of mixed rubber;
mixing the first-stage rubber compound, the tear-resistant resin, the zinc oxide and the anti-aging agent, when the mixing temperature is increased to 120-125 ℃, discharging the obtained mixture, cooling and standing to obtain a second-stage rubber compound;
mixing the two-stage rubber compound, insoluble sulfur, an accelerator and an anti-reversion agent, when the mixing temperature reaches 100-105 ℃, carrying out sheet discharging on the obtained mixture, cooling and standing to obtain the tread rubber of the aircraft tire;
and sequentially extruding and molding the aircraft tire tread rubber to obtain the aircraft tire tread rubber.
The preparation method comprises the steps of mixing plasticated rubber of natural rubber, adding the multi-wall carbon nano tube, the multifunctional vulcanization activator and the heat stabilizer to continue mixing when the mixing temperature is increased to 90-95 ℃, adding the medium-super wear-resistant carbon black, the white carbon black wet glue and the silane coupling agent to continue mixing when the mixing temperature is increased to 100-105 ℃ from 90-95 ℃, blanking the obtained mixture when the mixing temperature is increased to 140-145 ℃ from 100-105 ℃, cooling and standing to obtain a section of mixed rubber.
The invention has no special requirements on the preparation process of the plasticated rubber of the natural rubber, and the process for preparing the plasticated rubber well known in the field can be adopted. In the present invention, the mixing is preferably carried out in an internal mixer; the tableting is preferably carried out in a tablet press. In the invention, the parking time is preferably 16-24 h, and more preferably 18-22 h. In the standing process, the raw materials are automatically and slightly dispersed, rubber and carbon black form binding rubber, and the performance of the rubber compound is improved. The properties of the rubber mixtures which are not left standing and are directly subjected to the second-stage mixing are significantly lower than those of the rubber mixtures which are left standing. According to the invention, the multi-walled carbon nanotube, the multifunctional vulcanizing active agent, the heat stabilizer, the medium and super wear-resistant carbon black, the white carbon black wet glue and the silane coupling agent are added in one-stage mixing, so that the silane coupling agent, the zinc oxide and the anti-aging agent are prevented from reacting, the reaction effect of the silane coupling agent and the white carbon black is weakened, the white carbon black cannot be well combined with natural rubber, and the wear resistance and the low heat generation performance of the tread rubber are reduced.
After the first-stage rubber compound is obtained, the first-stage rubber compound, the tear-resistant resin, the zinc oxide and the anti-aging agent are mixed, when the mixing temperature is increased to 120-125 ℃, the obtained mixture is subjected to sheet discharging, cooling and standing to obtain the second-stage rubber compound. In the present invention, the mixing is preferably carried out in an internal mixer, and the tableting is preferably carried out in a tableting machine. In the invention, the parking time is preferably 16-24 h, and more preferably 18-22 h. The tear-resistant resin, the zinc oxide and the anti-aging agent are added during the two-stage mixing, so that the tear-resistant resin, the zinc oxide and the anti-aging agent are uniformly mixed.
After the second-stage rubber compound is obtained, the second-stage rubber compound, insoluble sulfur, an accelerator and an anti-vulcanization reversion agent are mixed, when the mixing temperature reaches 100-105 ℃, the obtained mixture is subjected to sheet discharging, cooling and standing to obtain the aircraft tire tread rubber. In the present invention, the mixing is preferably carried out in an internal mixer, and the tableting is preferably carried out in a tableting machine. In the invention, the parking time is preferably 16-24 h, and more preferably 18-22 h. The insoluble sulfur and the accelerant are easy to scorch at high temperature; the anti-reversion agent is easy to release S in advance at high temperature, so that the anti-reversion agent cannot play a role in resisting reversion when the tire is used, and is added during three-stage mixing.
The invention provides an application of the aircraft tire tread rubber in the scheme or the aircraft tire tread rubber prepared by the preparation method in the scheme in an aircraft tire. According to the invention, the aircraft tire tread rubber is extruded into a tread semi-finished product by an extruder; then the semi-finished product of the tire tread is attached to the upper part of the tire body on a forming machine to manufacture a tire blank; and finally, vulcanizing the tire blank into a finished product of the aircraft tire through a vulcanizing machine.
The invention provides an aircraft tire tread rubber, a preparation method and application thereof, which are described in detail in the following with reference to the examples, but the invention is not to be construed as being limited by the scope of the invention.
Examples 1 to 3
The preparation starting materials for examples 1 to 3 are shown in Table 4.
The preparation method of the aircraft tire tread rubber comprises the following steps:
first-stage mixing:
adding the natural rubber plasticated rubber into an internal mixer, wherein the mixing temperature is increased from 80 ℃ to 90 ℃; putting the multi-walled carbon nanotube, the multifunctional vulcanization activator and the heat stabilizer into an internal mixer according to a ratio, mixing and banburying, wherein the mixing temperature is increased from 90 ℃ to 100 ℃; adding medium and super wear-resistant carbon black, white carbon black wet glue and a silane coupling agent into an internal mixer according to a ratio, mixing and internally mixing, wherein the mixing temperature is increased from 100 ℃ to 140 ℃; and (3) discharging the mixture out of the internal mixer until the mixing temperature reaches 140 ℃ to the upper and lower pieces of the tablet press, cooling, and standing for 16 hours to obtain a section of rubber compound.
And (3) second-stage mixing:
putting the tear-resistant resin, the zinc oxide and the anti-aging agent into an internal mixer together with a section of rubber compound according to a proportion, mixing and internally mixing, wherein the mixing temperature is increased from 80 ℃ to 120 ℃; and (3) discharging the mixture out of the internal mixer until the mixing temperature reaches 120 ℃ to the upper and lower pieces of the tablet press, cooling, and standing for 24 hours to obtain the second-stage rubber compound.
Three-stage mixing:
adding insoluble sulfur, sulfenamide accelerator and anti-vulcanization reversion agent and the second-stage rubber compound into an internal mixer according to a ratio, and mixing and internally mixing to 100 ℃; and discharging the mixture out of the internal mixer to an upper sheet and a lower sheet of a tablet press, cooling, and standing for 16 hours to obtain the aircraft tire tread rubber.
Extruding the aircraft tire tread rubber into a tread semi-finished product by using an extruder; attaching the semi-finished product of the tread to the upper part of the tire body on a forming machine to prepare a tire blank; and vulcanizing the green tire by a vulcanizing machine to obtain the aircraft tire finished product.
TABLE 4 preparation of raw materials of examples 1 to 3
The performance of the aircraft tire tread rubber prepared in examples 1 to 3 was tested, and the test results are shown in table 5.
TABLE 5 Performance of Tread rubber for examples 1 to 3 and conventional aircraft tires
The tread rubber disclosed by the embodiment of the invention has the advantages of low compression heat generation, high tearing strength, good cutting resistance, good wear resistance, good flex cracking resistance, good ozone aging resistance, good thermal stability, higher tensile strength, higher elongation at break and the like, and can be used for aircraft tires.
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 (10)
1. The aircraft tire tread rubber is characterized by comprising the following preparation raw materials in parts by mass: 88-92 parts of natural rubber, 46-50 parts of medium-ultra wear-resistant carbon black, 12-18 parts of white carbon black wet-process rubber, 2-3 parts of silane coupling agent, 1-2 parts of heat stabilizer, 0.5-1 part of anti-vulcanization reversion agent, 1-3 parts of multifunctional vulcanization activator, 1.5-2.0 parts of tear-resistant resin, 3-5 parts of zinc oxide, 2-5 parts of anti-aging agent, 2.1-2.3 parts of insoluble sulfur, 1.0-1.1 parts of accelerator and 1-2 parts of multi-walled carbon nanotube;
the tensile strength of the natural rubber is more than or equal to 25.0MPa, the elongation at break is more than or equal to 800%, the tear strength is more than or equal to 30KN/m, the heat generation of compression is less than or equal to 8 ℃, and the natural rubber cracks for more than or equal to 6 hours under the conditions that the ozone concentration is 100pphm, the temperature is 40 ℃ and the elongation is 25%.
2. The aircraft tire tread rubber of claim 1, wherein the natural rubber is high-end natural rubber eosin # 1, a homemade product of Jiangcheng, Inc., of Yunnan Natural rubber industries group.
3. The aircraft tire tread rubber according to claim 1, wherein the antioxidant comprises p-phenylenediamine antioxidant 4020 and ketoamine antioxidant S-RD; based on the mass parts of the natural rubber, the mass parts of the p-phenylenediamine anti-aging agent 4020 are 1-3; the mass portion of the ketoamine antioxidant S-RD is 1-2.
4. The aircraft tire tread rubber according to claim 1, wherein the white carbon black wet-process rubber has a tensile strength of not less than 25.0MPa, a tensile elongation at break of not less than 400%, a 300% tensile stress of not less than 12.0MPa, and a carbon black dispersion degree of not less than 6.5.
5. The aircraft tire tread rubber according to claim 1 or 4, wherein the white carbon black wet process rubber is white carbon black wet process rubber SF175-50 produced by Menglan county Manzhu rubber Co.
6. The aircraft tire tread band of claim 1,
the medium and super wear-resistant carbon black is medium and super wear-resistant carbon black N220;
the silane coupling agent is a silane coupling agent Si 69;
the heat stabilizer is a heat stabilizer HS-80;
the anti-reversion agent is an anti-reversion agent WK-901;
the multifunctional vulcanization activator is a multifunctional vulcanization activator ZNZB 746;
the tear-resistant resin is tear-resistant resin SL-6903;
the insoluble sulfur is insoluble sulfur HD OT 20;
the accelerator is sulfonamide accelerator NS or sulfonamide accelerator NOBS.
7. The process for producing a tread rubber for an aircraft tire as claimed in any one of claims 1 to 6, comprising the steps of:
mixing plasticated rubber of natural rubber, adding a multi-wall carbon nano tube, a multifunctional vulcanization activator and a heat stabilizer for continuous mixing when the mixing temperature is increased to 90-95 ℃, adding medium-super wear-resistant carbon black, white carbon black wet glue and a silane coupling agent for continuous mixing when the mixing temperature is increased to 100-105 ℃ from 90-95 ℃, blanking the obtained mixture when the mixing temperature is increased to 140-145 ℃ from 100-105 ℃, cooling and standing to obtain a section of mixed rubber;
mixing the first-stage rubber compound, the tear-resistant resin, the zinc oxide and the anti-aging agent, when the mixing temperature is increased to 120-125 ℃, discharging the obtained mixture, cooling and standing to obtain a second-stage rubber compound;
and mixing the two-stage rubber compound, insoluble sulfur, an accelerator and an anti-vulcanization reversion agent, discharging the obtained mixture when the mixing temperature reaches 100-105 ℃, cooling and standing to obtain the aircraft tire tread rubber.
8. The method of claim 7, wherein each of said mixing is performed in an internal mixer; each of the said underfeeding is carried out in a tablet press.
9. The method of claim 7, wherein the parking time is 16-24 hours.
10. Use of the aircraft tire tread rubber according to any one of claims 1 to 6 or the aircraft tire tread rubber prepared by the preparation method according to any one of claims 7 to 9 in an aircraft tire.
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