CN111925569B - Inner tire nozzle rubber for aircraft tire and preparation method thereof - Google Patents
Inner tire nozzle rubber for aircraft tire and preparation method thereof Download PDFInfo
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- CN111925569B CN111925569B CN202010861525.XA CN202010861525A CN111925569B CN 111925569 B CN111925569 B CN 111925569B CN 202010861525 A CN202010861525 A CN 202010861525A CN 111925569 B CN111925569 B CN 111925569B
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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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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/262—Alkali metal carbonates
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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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/267—Magnesium carbonate
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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
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/326—Magnesium phosphate
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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
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention provides inner tire nozzle rubber for an aircraft tire and a preparation method thereof, and belongs to the technical field of high polymer materials. The inner tube tip rubber comprises natural rubber, high wear-resistant furnace black N330, white carbon black, eggshell powder, an accelerator DZ, zinc oxide, stearic acid, an anti-aging agent 4010NA, an anti-aging agent RD, an adhesive RS, an adhesive A, an adhesion accelerator AIR-101, disproportionated rosin, an anti-scorching agent CTP, insoluble sulfur and aromatic oil. According to the invention, the white carbon black, the adhesive RS, the adhesive A and the adhesion promoter AIR-101 are added, so that the inner tire valve rubber and the valve form chemical bond connection, and the disproportionated rosin can not only increase the self-adhesion of the inner tire valve rubber, but also improve the adhesion performance of the inner tire valve rubber and the valve, thereby improving the adhesion performance of the inner tire valve rubber and the valve.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to inner tire bead rubber for an aircraft tire and a preparation method thereof.
Background
With the continuous development of aviation industry, the flying speed and the flying height of an airplane are continuously improved, so that higher performance requirements are provided for all parts of an aviation tire, and particularly, the use safety of the airplane is influenced to a certain extent by the quality of the rubber material performance of the inner nozzle rubber of the aviation tire. The existing aviation tire inner tube nozzle rubber has the problem of low bonding strength with a valve nozzle. Because the bonding strength of the inner tire valve rubber and the valve is low, the valve is frequently required to be polished before the rubber is attached, and a layer of adhesive is additionally coated to improve the bonding strength of the inner tire valve rubber and the valve.
Disclosure of Invention
In view of the above, the invention aims to provide an inner nozzle rubber for aircraft tires and a preparation method thereof. The inner tire valve rubber for the aircraft tire provided by the invention has good adhesion with the valve, and does not need to be additionally coated with an adhesive.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides an inner nozzle rubber for an aircraft tire, which comprises the following components in parts by mass:
100 parts of natural rubber, 25-30 parts of high-wear-resistance furnace black N330, 5-10 parts of white carbon black, 5 parts of eggshell powder, 0.4-0.6 part of accelerator DZ, 25 parts of zinc oxide, 0.4 part of stearic acid, 1.5-2 parts of antioxidant 4010NA, 1.5-2 parts of antioxidant RD, 5-5.5 parts of adhesive RS, 3-4 parts of adhesive A, 1012-2.5 parts of adhesion accelerator AIR-1.5 parts of disproportionated rosin, 0.2 part of antiscorching agent CTP, 4-5 parts of insoluble sulfur and 3-4 parts of aromatic oil.
Preferably, the composition comprises the following components in parts by mass:
100 parts of natural rubber, 7 parts of white carbon black, 5 parts of eggshell powder, 0.5 part of accelerator DZ, 25 parts of zinc oxide, 0.4 part of stearic acid, 1.5 parts of antioxidant 4010NA, 2 parts of antioxidant RD, 5.5 parts of adhesive RS, 4 parts of adhesive A, 1012.5 parts of adhesion accelerator AIR-1012.5 parts, 1.5 parts of disproportionated rosin, 0.2 part of antiscorching agent CTP, 5 parts of insoluble sulfur and 4 parts of aromatic oil.
Preferably, the natural rubber is No. 1 smoked sheet rubber and/or SCR5 standard rubber.
Preferably, the mass fraction of calcium carbonate in the eggshell powder is 93%, the sum of the mass fractions of magnesium carbonate and magnesium phosphate is 3.8%, and the mass fraction of organic matters is 3.2%.
Preferably, the aperture of the eggshell powder is 0.1 to 0.7 μm.
The invention also provides a preparation method of the inner nozzle rubber for the aircraft tire, which comprises the following steps:
carrying out primary banburying on natural rubber, white carbon black and eggshell powder to obtain a primary banburying material;
carrying out secondary banburying on the primary banburying material, the anti-aging agent 4010NA, the anti-aging agent RD, the adhesive RS, the adhesion promoter AIR-101, the zinc oxide, the stearic acid and the disproportionated rosin to obtain a secondary banburying material;
carrying out three times of banburying on the secondary banburying material, the high-wear-resistant furnace black N330 and aromatic oil to obtain a first-stage rubber compound;
and carrying out two-stage mixing on the first-stage rubber compound, the adhesive A, the accelerator DZ, the scorch retarder CTP and insoluble sulfur to obtain the inner nozzle rubber for the aircraft tire.
Preferably, the primary banburying is carried out at the temperature of between 100 and 105 ℃ and between 110 and 115 ℃ for 30s.
Preferably, the secondary banburying is carried out at the temperature of 110-115 ℃ and the temperature of 120-125 ℃ for 50s.
Preferably, the third banburying is carried out at the temperature of between 120 and 125 ℃ and the temperature of between 140 and 145 ℃ for 140s.
Preferably, the temperature of the two-stage mixing is 100-105 ℃, and the holding time is 100s
The invention provides an inner nozzle rubber for an aircraft tire, which comprises the following components in parts by mass: 100 parts of natural rubber, 25-30 parts of high-wear-resistance furnace black N330, 5-10 parts of white carbon black, 5 parts of eggshell powder, 0.4-0.6 part of accelerator DZ, 25 parts of zinc oxide, 0.4 part of stearic acid, 1.5-2 parts of antioxidant 4010NA, 1.5-2 parts of antioxidant RD, 5-5.5 parts of adhesive RS, 3-4 parts of adhesive A, 1012-2.5 parts of adhesion accelerator AIR-1.5 parts of disproportionated rosin, 0.2 part of antiscorching agent CTP, 4-5 parts of insoluble sulfur and 3-4 parts of aromatic oil. According to the invention, the white carbon black, the adhesive RS (a blend of resorcinol and stearic acid), the adhesive A (hexamethoxymethylmelamine) and the adhesion promoter AIR-101 are added, and the white carbon black has the advantages of high strength, low heat generation and excellent adhesion performance with a metacresol system (comprising the adhesive RS and the adhesive A), so that the inner tire valve rubber and the valve form chemical bond connection; the disproportionated rosin can not only increase the self-adhesion of the inner tire valve rubber, but also improve the adhesion performance of the inner tire valve rubber and the inflating valve, so that the adhesion performance of the inner tire valve rubber and the inflating valve is improved, the process that a layer of adhesive needs to be additionally coated on the inflating valve during the traditional aviation tire inner tire valve rubber and inflating valve adhesion can be omitted, the production efficiency is greatly improved, and the potential safety hazard caused by the adhesive is reduced; in the invention, the natural rubber has the advantages of high strength, large elasticity, good processability and excellent bonding performance with other materials; the high wear-resistant furnace black N330 has the advantages of good tensile property, high tearing strength and better elasticity; the accelerator DZ (N, N-dicyclohexyl-2-benzothiazole sulfenamide) belongs to sulfenamide accelerators, and has the advantages of long scorching time, high vulcanization activity, high vulcanization speed and high mechanical properties (such as tensile strength, elasticity, aging resistance and dynamic properties) of vulcanized rubber; the zinc oxide and the stearic acid are taken as vulcanization activators to play a role in activation, so that the vulcanization speed can be increased, and the mechanical property of vulcanized rubber can be improved; the antioxidant RD is a ketoamine condensate antioxidant, the antioxidant 4010NA is a p-phenylenediamine antioxidant, and the antioxidants are all rubber universal excellent antioxidants, have excellent protection effects on ozone aging and flex cracking, and are also excellent protectors for heat, oxygen, light and general aging; the scorch retarder CTP (N-cyclohexyl thiophthalimide) can prevent the rubber compound from generating early vulcanization phenomenon before processing; aromatic oil is used as a plasticizer, so that the processing performance of the rubber material can be improved; the insoluble sulfur can avoid sulfur spraying on the surfaces of the mixing rubber and the semi-finished rubber material.
Through reasonable formula design, the obtained aircraft tire inner tube nozzle rubber has self-adhesion and high bonding strength with an air valve, and the rubber material has high elongation at break and good aging resistance, and all properties of the rubber material meet the performance requirements of the aircraft tire inner tube nozzle rubber. The aviation tire inner tube nozzle rubber provided by the invention is applied to the connecting part of the inner tube and the valve in the aviation tire, so that the problems of tire leakage, explosion and the like caused by the falling or delamination of the valve due to the problems of low bonding strength and poor aging resistance of the inner tube and the valve in the use process of the aviation tire can be avoided.
The data of the examples show the properties of the inner nozzle rubber for aircraft tires provided by the invention as shown in table 1.
Table 1 properties of inner nozzle rubber for aircraft tire according to the invention
Drawings
Fig. 1 is a schematic structural diagram of an aircraft outer tire and an inner tire, wherein 1 is the aircraft outer tire, 2 is aircraft inner tire casing rubber, 3 is a rim, 4 is inner tire nozzle rubber for the aircraft tire, and 5 is a valve.
Detailed Description
The invention provides an inner tire nozzle rubber for an aircraft tire, which comprises the following components in parts by mass:
100 parts of natural rubber, 25-30 parts of high-wear-resistance furnace black N330, 5-10 parts of white carbon black, 5 parts of eggshell powder, 0.4-0.6 part of accelerator DZ, 25 parts of zinc oxide, 0.4 part of stearic acid, 1.5-2 parts of antioxidant 4010NA, 1.5-2 parts of antioxidant RD, 5-5.5 parts of adhesive RS, 3-4 parts of adhesive A, 1012-2.5 parts of adhesion accelerator AIR-1.5 parts of disproportionated rosin, 0.2 part of antiscorching agent CTP, 4-5 parts of insoluble sulfur and 3-4 parts of aromatic oil.
In the present invention, the starting materials used are all commercial products in the art unless otherwise specified.
In the invention, the inner nozzle rubber for the aircraft tire preferably comprises the following components in parts by mass:
100 parts of natural rubber, 7 parts of white carbon black, 5 parts of eggshell powder, 0.5 part of accelerator DZ, 25 parts of zinc oxide, 0.4 part of stearic acid, 1.5 parts of antioxidant 4010NA, 2 parts of antioxidant RD, 5.5 parts of adhesive RS, 4 parts of adhesive A, 1012.5 parts of adhesion accelerator AIR-1012.5 parts of disproportionated rosin, 0.2 part of antiscorching agent CTP, 5 parts of insoluble sulfur and 4 parts of aromatic oil;
or
100 parts of natural rubber, 10 parts of white carbon black, 5 parts of eggshell powder, 0.5 part of accelerator DZ, 25 parts of zinc oxide, 0.4 part of stearic acid, 1.5 parts of antioxidant 4010NA, 2 parts of antioxidant RD, 5.5 parts of adhesive RS, 4 parts of adhesive A, 1012.5 parts of adhesion accelerator AIR-1012.5 parts of disproportionated rosin, 0.2 part of antiscorching agent CTP, 5 parts of insoluble sulfur and 4 parts of aromatic oil;
or
100 parts of natural rubber, 5 parts of high-wear-resistance furnace black N33030 parts, 5 parts of white carbon black, 5 parts of eggshell powder, 0.4 part of accelerator DZ, 25 parts of zinc oxide, 0.4 part of stearic acid, 2 parts of anti-aging agent 4010NA, 1.5 parts of anti-aging agent RD, 5 parts of adhesive RS, 3 parts of adhesive A, 1012 parts of adhesion accelerator AIR-1012, 1.5 parts of disproportionated rosin, 0.2 part of anti-scorching agent CTP, 4 parts of insoluble sulfur and 3 parts of aromatic oil.
In the present invention, the natural rubber is preferably # 1 smoked sheet rubber and/or SCR5 standard rubber. In the invention, the natural rubber has the advantages of high strength, large elasticity, good processability and excellent bonding performance with other materials.
In the invention, the white carbon black is preferably white carbon black VN3 GR.
In the invention, the mass fraction of calcium carbonate in the eggshell powder is 93%, the sum of the mass fractions of magnesium carbonate and magnesium phosphate is 3.8%, and the mass fraction of organic matters is 3.2%. In the invention, the aperture of the eggshell powder is preferably 0.1-0.7 μm. According to the invention, the eggshell powder has the advantages of porosity, multi-mineral content and more organic matters, is a bio-based renewable filler, has a reinforcing effect equivalent to that of a traditional filler, can also reduce cost and environmental pollution, completely meets the secondary utilization of resources, has smaller polarity than that of carbon black and white carbon black, is easier to form rubber-filler interaction, and promotes the dispersion of the white carbon black through the characteristics of the porosity and the multi-mineral content, and the rubber-filler interaction means that: the rubber and the filler are connected together through the interaction of chemical bonds or physical bonds, and as the rubber belongs to a non-polar substance, the polarity of the eggshell powder is relatively small (compared with carbon black and white carbon black), and substances with similar polarities are easily combined together, the eggshell powder and the rubber are easy to form the interaction of 'rubber-filler'. In the present invention, the eggshell powder is preferably purchased from Hibei Qiansheng Biotechnology Co., ltd.
According to the invention, the white carbon black, the adhesive RS (a blend of resorcinol and stearic acid), the adhesive A (hexamethoxymethylmelamine) and the adhesion promoter AIR-101 are added, the white carbon black has the advantages of high strength, low heat generation and excellent adhesion performance with a metacarpium system (comprising the adhesive RS and the adhesive A), so that the inner tire valve rubber and the valve form chemical bond connection, and the inner tire valve rubber also contains disproportionated rosin, which not only can increase the self-adhesion of the inner tire valve rubber, but also can improve the adhesion performance of the inner tire valve rubber and the valve, thereby improving the adhesion performance of the inner tire valve rubber and the valve, and omitting a process of additionally coating a layer of adhesive on the polished valve when the traditional aviation tire inner tire valve rubber and the valve are adhered, so that the production efficiency is greatly improved, and the potential safety hazard brought by the adhesive is also reduced.
In the invention, the high wear-resistant furnace black N330 has the advantages of good tensile property, high tearing strength and good elasticity.
In the invention, the accelerator DZ (N, N-dicyclohexyl-2-benzothiazole sulfenamide) belongs to sulfenamide accelerators, and has the advantages of long scorching time, high vulcanization activity, high vulcanization speed and high mechanical properties (such as tensile strength, elasticity, aging resistance and dynamic properties) of vulcanized rubber.
In the invention, the zinc oxide and the stearic acid are taken as vulcanization activators to play a role in activation, so that the vulcanization rate can be increased and the mechanical property of vulcanized rubber can be improved.
In the invention, the antioxidant RD is a ketoamine condensate antioxidant, the antioxidant 4010NA is a p-phenylenediamine antioxidant, and the antioxidants are all rubber universal excellent antioxidants, have excellent protection effects on ozone aging and flex cracking, and are also excellent protectors for heat, oxygen, light and general aging.
In the invention, the scorch retarder CTP (N-cyclohexyl thiophthalimide) can prevent the rubber compound from generating early vulcanization phenomenon before processing.
In the invention, the disproportionated rosin is used as a tackifier, so that the self-adhesion between rubber materials can be increased, and the adhesion between the rubber materials and the inflating valve is promoted.
In the invention, the aromatic oil is used as a plasticizer, so that the processing performance of the rubber material can be improved.
In the present invention, the insoluble sulfur IS preferably insoluble sulfur IS-60. In the invention, the insoluble sulfur can avoid sulfur spraying on the surfaces of the mixing rubber and the semi-finished rubber material.
The invention also provides a preparation method of the inner nozzle rubber for the aircraft tire, which comprises the following steps:
carrying out primary banburying on natural rubber, white carbon black and eggshell powder to obtain a primary banburying material;
carrying out secondary banburying on the primary banburying material, the anti-aging agent 4010NA, the anti-aging agent RD, the adhesive RS, the adhesion promoter AIR-101, the zinc oxide, the stearic acid and the disproportionated rosin to obtain a secondary banburying material;
carrying out three times of banburying on the secondary banburying material, the high-wear-resistant furnace black N330 and aromatic oil to obtain a first-stage rubber compound;
and carrying out secondary mixing on the first-stage rubber compound, the adhesive A, the accelerator DZ, the scorch retarder CTP and insoluble sulfur to obtain the inner nozzle rubber for the aircraft tire.
The method comprises the step of carrying out primary banburying on natural rubber, white carbon black and eggshell powder to obtain a primary banburying material. In the invention, the primary banburying is preferably increased from 100-105 ℃ to 110-115 ℃, the heat preservation time is preferably 30s, and the temperature increase rate in the primary banburying process is not particularly limited in the invention. In the present invention, said primary mixing is preferably carried out in an internal mixer.
After the primary internal mixing material is obtained, the primary internal mixing material, the anti-aging agent 4010NA, the anti-aging agent RD, the adhesive RS, the adhesion promoter AIR-101, the zinc oxide, the stearic acid and the disproportionated rosin are subjected to secondary internal mixing to obtain a secondary internal mixing material. In the invention, the secondary banburying is preferably carried out from 110-115 ℃ to 120-125 ℃, and the holding time is preferably 50s. The temperature rise rate in the secondary banburying process is not specially limited. In the present invention, the secondary internal mixing is preferably carried out in an internal mixer.
After the secondary banburying material is obtained, the secondary banburying material, the high-wear-resistant furnace black N330 and the aromatic oil are banburied for three times to obtain a first-stage rubber compound. In the invention, the three times of banburying are preferably increased from 120-125 ℃ to 140-145 ℃, and the heat preservation time is preferably 140s. The invention has no special limit on the heating rate in the three banburying processes. In the present invention, the triple internal mixing is preferably carried out in an internal mixer.
After the three banburying processes are finished, the mixture is preferably discharged out of the banbury mixer to the upper and lower sheets of the tablet press, and is sequentially cooled and parked to obtain the first-stage rubber compound. The specific parameters of cooling and parking are not particularly limited in the present invention, and may be performed in a manner known to those skilled in the art, and in the specific embodiment of the present invention, it is preferable to park for 16-24 hours after natural cooling.
In the present invention, the total process of the primary banburying, the secondary banburying and the tertiary banburying is referred to as primary banburying.
After the first-stage rubber compound is obtained, the first-stage rubber compound, the adhesive A, the accelerator DZ, the scorch retarder CTP and insoluble sulfur are subjected to second-stage mixing to obtain the inner nozzle rubber for the aircraft tire.
In the present invention, the temperature of the two-stage kneading is preferably 100 to 105 ℃ and the holding time is preferably 100 seconds. In the present invention, the rate of temperature rise to the temperature for the two-stage kneading is not particularly limited. In the present invention, the two-stage mixing is preferably carried out in an internal mixer.
After the two-stage mixing is completed, the mixture is preferably discharged from an internal mixer to an upper sheet and a lower sheet of a tablet press, and the mixture is sequentially cooled and parked to obtain the inner nozzle rubber for the aircraft tire. The specific parameters of cooling and parking are not particularly limited in the present invention, and may be performed in a manner known to those skilled in the art, and in the specific embodiment of the present invention, it is preferable to park for 16-24 hours after natural cooling.
The invention also provides an application of the inner nozzle rubber in the technical scheme in an aircraft tire, wherein the application is preferably as follows: and after the inflating valve and the inner tube are attached and molded through the inner tube valve rubber, obtaining an aircraft tire inner tube finished product through vulcanization, and assembling the aircraft tire inner tube finished product and the outer tube to obtain the aircraft tire. The present invention is not particularly limited with respect to the specific manner of application, molding, vulcanization and assembly, and may be practiced in a manner well known to those skilled in the art.
Fig. 1 is a schematic structural diagram of an aircraft outer tire and an inner tire, wherein 1 is the aircraft outer tire, 2 is aircraft inner tire casing rubber, 3 is a rim, 4 is inner tire nozzle rubber, and 5 is a valve.
For further illustration of the present invention, the inner nozzle rubber for aircraft tire and the preparation method thereof provided by the present invention will be described in detail with reference to examples, but they should not be construed as limiting the scope of the present invention.
Examples
The raw material amounts of the inner nozzle rubber for aircraft tires of examples 1 to 3 and comparative examples 1 to 2 are shown in table 2. The eggshell powder used in the embodiment contains 93% of calcium carbonate by mass, 3.8% of magnesium carbonate and magnesium phosphate by mass, 3.2% of organic matters by mass and 0.1-0.7 μm of aperture, and is purchased from Hebei Qianbeng biotechnology limited company.
Table 2 raw material amounts of inner bead rubbers for aircraft tires of examples 1 to 3 and comparative examples 1 to 2
The preparation process of the inner nozzle rubber for the aircraft tire in the examples 1 to 3 and the comparative examples 1 to 2 is as follows:
first-stage mixing:
(1) Putting the No. 1 smoked sheet rubber, white carbon black VN3 GR and eggshell powder into an internal mixer, mixing and internally mixing, wherein the mixing temperature is increased from 100 ℃ to 110 ℃, and keeping the temperature for 30s;
(2) Putting the anti-aging agent 4010NA, the anti-aging agent RD, the adhesive RS, the adhesion promoter AIR-101, the zinc oxide, the stearic acid and the disproportionated rosin into an internal mixer according to the proportion, mixing and banburying, wherein the mixing temperature is increased from 110 ℃ to 120 ℃, and keeping the temperature for 50s;
(3) Adding N330 carbon black and aromatic oil into an internal mixer according to a proportion, mixing and internally mixing, wherein the mixing temperature is increased from 120 ℃ to 140 ℃, and keeping the temperature for 140s;
(4) And discharging the mixture out of the internal mixer to the upper and lower pieces of the tablet press, cooling and standing to obtain a first-stage rubber compound.
And (3) second-stage mixing:
(1) Standing the first-stage rubber compound for 16h, adding insoluble sulfur IS-60, an accelerator DZ, an adhesive A and an anti-glue agent CTP into an internal mixer together with the first-stage rubber compound according to a certain proportion, mixing and internally mixing to 100 ℃, and keeping the temperature for 100s;
(2) And discharging the mixture out of the internal mixer to an upper sheet and a lower sheet of a tablet press, cooling and standing, wherein the rubber is inner tire nozzle rubber for aviation tires.
The performances of the inner nozzle rubbers for aircraft tires obtained in examples 1 to 3 and comparative examples 1 to 2 were measured, and the results are shown in table 3. As can be seen from table 3, when the formula of the aircraft tire inner tube plug adhesive of the present invention is adopted and additives such as eggshell powder and disproportionated rosin are added according to a certain proportion, the inner tube plug adhesive has superior strength performance and adhesion performance (as in example 1), and both are higher than the prior art level, which indicates that the aircraft tire inner tube plug adhesive of the present invention has great development and application prospects.
Table 3 properties of inner nozzle rubbers for aircraft tires obtained in examples 1 to 3 and comparative examples 1 to 2
The inner tube plug glue for the aircraft tire prepared in the embodiments 1 to 3 is respectively attached to an air valve and an inner tube, formed, finally vulcanized by a vulcanizing machine (166 ℃ for 10 min) to prepare an aircraft tire inner tube, and assembled with an outer tube to obtain an aircraft tire finished product.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (8)
1. The inner tire nozzle rubber for the aircraft tire is characterized by comprising the following components in parts by mass:
100 parts of natural rubber, 25 parts of high-wear-resistance furnace black N330, 10 parts of white carbon black, 5 parts of eggshell powder, 0.5 part of accelerator DZ, 25 parts of zinc oxide, 0.4 part of stearic acid, 1.5 parts of antioxidant 4010NA, 2 parts of antioxidant RD, 5.5 parts of adhesive RS, 4 parts of adhesive A, 2.5 parts of adhesion accelerator AIR-101, 1.5 parts of disproportionated rosin, 0.2 part of antiscorching agent CTP, 5 parts of insoluble sulfur and 4 parts of aromatic oil; the mass fraction of calcium carbonate in the eggshell powder is 93%, the sum of the mass fractions of magnesium carbonate and magnesium phosphate is 3.8%, and the mass fraction of organic matters is 3.2%.
2. Inner nozzle rubber for aircraft tires according to claim 1, characterized in that the natural rubber is # 1 smoked sheet rubber and/or SCR5 standard rubber.
3. The inner nozzle rubber for the aircraft tire according to claim 1, wherein the pore size of the eggshell powder is 0.1 to 0.7 μm.
4. A process for the preparation of an inner nozzle rubber for aircraft tires according to any of claims 1 to 3, characterized by comprising the following steps:
carrying out primary banburying on natural rubber, white carbon black and eggshell powder to obtain a primary banburying material;
carrying out secondary banburying on the primary banburying material, the anti-aging agent 4010NA, the anti-aging agent RD, the adhesive RS, the adhesion promoter AIR-101, the zinc oxide, the stearic acid and the disproportionated rosin to obtain a secondary banburying material;
carrying out three times of banburying on the secondary banburying material, the high-wear-resistant furnace black N330 and aromatic oil to obtain a first-stage rubber compound;
and carrying out two-stage mixing on the first-stage rubber compound, the adhesive A, the accelerator DZ, the scorch retarder CTP and insoluble sulfur to obtain the inner nozzle rubber for the aircraft tire.
5. The preparation method according to claim 4, wherein the primary banburying is carried out at a temperature of between 100 and 105 ℃ and between 110 and 115 ℃ for 30s.
6. The preparation method of claim 4, wherein the secondary banburying is carried out at a temperature of between 110 and 115 ℃ and a temperature of between 120 and 125 ℃ for 50s.
7. The preparation method according to claim 4, wherein the third banburying is carried out at a temperature of between 120 and 125 ℃ and 140 and 145 ℃ for 140s.
8. The process according to claim 4, wherein the temperature of the two-stage kneading is 100 to 105 ℃ and the holding time is 100 seconds.
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| CN112759804A (en) * | 2020-12-29 | 2021-05-07 | 四川川环科技股份有限公司 | Sealant applied to wheel outer ring steel wire rim |
| CN113929978B (en) * | 2021-11-05 | 2023-09-26 | 中国化工集团曙光橡胶工业研究设计院有限公司 | Solid aviation tire lower tread rubber and preparation method thereof |
| CN115785537A (en) * | 2022-12-16 | 2023-03-14 | 中国化工集团曙光橡胶工业研究设计院有限公司 | Repair adhesive for hot repair of aircraft tire appearance defects and preparation method and application thereof |
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