CN110183746B - Tire cushion rubber protecting composition with nozzle and preparation method thereof - Google Patents
Tire cushion rubber protecting composition with nozzle and preparation method thereof Download PDFInfo
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
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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
- C08K2201/011—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
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention provides a tire flap nozzle rubber protection composition and a preparation method thereof, which solve the technical problems that an external metal gasket of the conventional tire flap is easy to cut a cover tire or the flap and is easy to wear, and the tire flap nozzle rubber protection composition comprises the following raw materials in parts by weight: 70-95 parts of isoprene rubber, 5-30 parts of SBR1507 rubber, 2.5-5 parts of nano zinc oxide, 1.5-3 parts of stearic acid, 1.5-3 parts of a dispersing agent HT, 5-20 parts of white carbon black, 1-3 parts of a carbon black N35140, 1-3 parts of an anti-aging agent DTPD, 1-3 parts of an anti-aging agent IPPD, 1-2 parts of a silane coupling agent NXT, 1-3 parts of resin A-250, 5-5 parts of insoluble sulfur OT 70203, 0.8-1.5 parts of an accelerator TBSI, 1-3 parts of a vulcanizing agent DTDM and 652-6 parts of a methylene donor RA; wherein the total parts of the isoprene rubber and the SBR1507 rubber are 100 parts; meanwhile, the preparation method of the rubber protective composition with the nozzle for the tire pad comprises the steps of first-stage mixing, second-stage mixing, third-stage vulcanizing and film forming, and can be widely applied to the technical field of rubber tires.
Description
Technical Field
The invention relates to the technical field of rubber tires, in particular to a tire pad nozzle rubber protection composition and a preparation method thereof.
Background
The tire is an important component of a vehicle, affects the performance of the vehicle, and is more concerned with the driving safety, and a common pneumatic tire with an inner tube mainly comprises an outer tube, an inner tube and a cushion belt. The inner tube is filled with compressed air, and the outer tube is used for protecting the inner tube from being damaged and has certain elasticity; the rim strip is a device arranged between the rim and the inner tube and used for protecting the inner tube, and in the process of operation, the rim strip can avoid the damage of the inner tube caused by long-term friction with the rim, and can also slow down the extrusion of the toe opening of the outer tube on the inner tube, thereby prolonging the service life of the inner tube.
The inner tube valve nozzle penetrates through the wheel hub slot hole and extends inwards to the wheel rim side, therefore, the position of the cushion belt valve hole is easy to damage under the friction of the inner tube valve nozzle, in order to avoid the abrasion of the cushion belt valve hole position, at present, a metal gasket is generally additionally arranged at the position of the cushion belt valve hole position, the authorization notice number is CN201761293U, the metal gasket is arranged between the wheel rim and the tire cushion belt, the inner tube valve nozzle penetrates through the valve hole on the metal gasket and extends into the wheel hub slot hole, further, the direct contact between the tire cushion belt and the valve nozzle is avoided, the abrasion of the inner tube valve nozzle to the cushion belt is prevented, meanwhile, the metal gasket is provided with the bulge which can be arranged in the wheel hub slot hole, the bulge is embedded in the wheel hub slot hole, and further, the position of the metal gasket is fixed, prevent the damage of it because of taking place dislocation and skew and leading to, prolonged metal gasket's life. However, in the actual use process, there are still two main disadvantages:
(1) the external metal gasket is arranged at the mouth hole part of the cushion belt, so that the hidden danger that the edge of the metal gasket or the broken section cuts the outer tire or the cushion belt exists, and the use of the outer tire or the cushion belt is influenced.
(2) In the mounting process of the rim strip, although the direct contact between the existing metal gasket and the valve can be avoided, in the using process of the tire, the displacement of the inner tube inevitably occurs, so that the valve on the inner tube is in direct contact with the metal gasket, the abrasion of the valve on the inner tube on the metal gasket is caused, and the service life of the rim strip is shortened.
Disclosure of Invention
The invention aims to solve the technical defects, and provides a tire rim strip nozzle rubber-protecting composition and a preparation method thereof, which can prolong the service life of a rim strip.
Therefore, the invention provides a tire pad nozzle rubber protection composition which comprises the following raw materials in parts by weight:
70-95 parts of isoprene rubber, 5-30 parts of SBR1507 rubber, 2.5-5 parts of nano zinc oxide, 1.5-3 parts of stearic acid, 1.5-3 parts of a dispersing agent HT, 5-20 parts of white carbon black, 40-70 parts of carbon black N351, 1-3 parts of an anti-aging agent DTPD, 1-3 parts of an anti-aging agent IPPD, 1-2 parts of a silane coupling agent NXT, 1-3 parts of resin A-250, 3-5 parts of insoluble OT7020, 0.8-1.5 parts of a promoter TBSI, 1-3 parts of a vulcanizing agent DTDM and 2-6 parts of a methylene donor RA 65; wherein the total parts of the isoprene rubber and the SBR1507 rubber are 100 parts.
Preferably, the tire pad nozzle rubber protecting composition comprises the following raw materials in parts by weight:
80-95 parts of isoprene rubber, 5-20 parts of SBR1507 rubber, 3-5 parts of nano zinc oxide, 1.5-3 parts of stearic acid, 2-3 parts of a dispersing agent HT, 5-18 parts of white carbon black, 55-70 parts of carbon black N351, 1-3 parts of an anti-aging agent DTPD, 1-3 parts of an anti-aging agent IPPD, 1-1.8 parts of a silane coupling agent NXT, 1.5-3 parts of resin A-250, 4-5 parts of insoluble OT7020, 0.8-1.5 parts of a promoter TBSI, 1-3 parts of a vulcanizing agent DTDM and 3-6 parts of a methylene donor RA 65.
Preferably, the tire pad nozzle rubber protecting composition comprises the following raw materials in parts by weight:
90 parts of isoprene rubber, 10 parts of SBR1507 rubber, 4 parts of nano zinc oxide, 3 parts of stearic acid, 2.5 parts of a dispersing agent HT, 18 parts of white carbon black, 57 parts of carbon black N351, 3 parts of an anti-aging agent DTPD, 1 part of an anti-aging agent IPPD, 1.8 parts of a silane coupling agent NXT, 2.5 parts of resin A-250, 4 parts of insoluble sulfur OT7020, 1 part of an accelerator TBSI, 3 parts of a vulcanizing agent DTDM and 5 parts of a methylene donor RA 65.
The preparation method of the tire pad nozzle rubber protecting composition comprises the following steps:
(1) first-stage mixing: adding isoprene rubber, SBR1507 rubber, nano zinc oxide, stearic acid, a dispersing agent HT, an anti-aging agent DTPD, an anti-aging agent IPPD, a silane coupling agent NXT, resin A-250 and a pressure bolt for 40s from a feeding port of an internal mixer; then lifting an upper top plug of the internal mixer, adding white carbon black and partial carbon black N351 from a feeding port of the internal mixer, and pressing the plug for 40 s; opening a discharge port of the internal mixer when the temperature of the rubber material in the internal mixer reaches 155 ℃, discharging the internal mixer rubber material, and cooling a lower sheet on an open mill, wherein the temperature is controlled at 18-45 ℃; standing at room temperature for 4-16 h to obtain a first-stage mixed rubber material;
(2) mixing in the second stage; adding the first-stage mixed rubber material obtained in the step (1) from a feeding port of an internal mixer, and pressing for 40 s; then lifting the upper top bolt of the internal mixer, adding the rest carbon black N351 from a feeding port of the internal mixer, and pressing the bolt for 40 s; opening a discharge port of the internal mixer when the temperature of the rubber material in the internal mixer reaches 155 ℃, discharging the internal mixer rubber material, and cooling a lower sheet on an open mill, wherein the temperature is controlled at 18-45 ℃; standing at room temperature for 4-16 h to obtain a two-stage mixed rubber material;
(3) three-stage sulfurization: adding the two-stage mixed rubber material obtained in the step (2) from a feeding port of an internal mixer, and pressing for 40 s; then lifting the top plug of the internal mixer, adding insoluble sulfur OT7020, an accelerator TBSI, a vulcanizing agent DTDM and a methylene donor RA65 from a feeding port of the internal mixer, and pressing for 40 s; opening a discharge port of the internal mixer when the temperature of the rubber material in the internal mixer reaches 100 ℃, discharging the internal mixer rubber material, and cooling a lower sheet on an open mill, wherein the temperature is controlled at 18-45 ℃; standing at room temperature for 8-96 h to obtain three-stage vulcanized rubber;
(4) film forming: adding the three sections of vulcanized rubber materials obtained in the step (3) into a cold feed extruder, extruding rubber sheets, and controlling the temperature to be 18-45 ℃; standing for 4-24 h at room temperature to obtain the tire pad nozzle rubber protecting composition.
Preferably, in the step (1), the step (2) and the step (3), the rotor speed of the internal mixer is 20-60 rpm, and the ram oil pressure on the internal mixer is 0.4-0.6 MPa.
Preferably, the internal mixer is XM-270 internal mixer, and the cold feed extruder is XJ-150.
The invention has the beneficial effects that: the invention provides a tire cushion belt nozzle rubber protection composition and a preparation method thereof, wherein the nozzle hole part of the cushion belt is connected with the cushion belt nozzle rubber protection, on one hand, the cushion belt and the cushion belt nozzle rubber protection both belong to elastic rubber materials, and can buffer external force together in the running process of a tire, thereby effectively prolonging the service life of the cushion belt; on the other hand, the rubber protection of the pad nozzle has the performances of high strength, high hardness, high wear resistance, thermal-oxidative aging resistance and the like, and is a rubber high-elasticity material, so that the service life of the pad belt is effectively prolonged; thirdly, the step of installing the external metal gasket in the prior art is saved, the labor intensity is reduced, the labor cost is reduced, and the human resources are saved.
Drawings
FIG. 1 is a schematic diagram of a prior art cushion belt;
FIG. 2 is a schematic view of a structure of a rim strip equipped with a rim strip mouth protector;
FIG. 3 is a schematic structural view of a cross-sectional view A-A shown in FIG. 2;
fig. 4 is a schematic structural view of a sectional view B-B shown in fig. 2.
The labels in the figure are: 1. cushion belt, 2. cushion belt nozzle hole, 3. cushion belt nozzle protective glue.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments to assist understanding of the invention. The method used in the invention is a conventional method if no special provisions are made; the raw materials and the apparatus used are, unless otherwise specified, conventional commercially available products.
The raw materials described in the following examples are all commercially available. Wherein the isoprene rubber is an imported Russian product; SBR1507 rubber is a Qilu petrochemical product; the nano zinc oxide is a product of Ziboxing New Material Co., Ltd; stearic acid is a product of a chemical general factory in Rong Cheng market; the dispersant HT is a Zibodelm industry product; the white carbon black is a product of New functional materials of Shandong Unico-technology, Inc.; carbon black N351 is a product of Shanxi Sanqiang New energy science and technology company; the anti-aging agent DTPD is a product of Nanjing chemical general plant; the anti-aging agent IPPD is a product of Nanjing chemical industry general works; the silane coupling agent NXT is a product of Shanghai Qi detailed chemical company; resin A-250 is a product of Santa Lakets International trade (Shanghai) Inc.; the insoluble sulfur OT7020 is a product of Shanghai Jinghai chemical Co., Ltd; the promoter TBSI is a product of Wenzhou Gray chemical Co., Ltd; the vulcanizing agent DTDM is a product of a Rongcheng chemical industry general factory; methylene donor RA65 is a product of Johnson auxiliary, Inc.
The formula of a tire cushion nozzle rubber-protecting composition described in example 1, example 2, example 3, example 4 and example 5 is shown in table 1: (the content unit of each raw material in table 1 is weight portion) table 1: formula of adhesive layer of heat-resistant polyester canvas conveying belt
| Formulation components | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Isoprene rubber | 70 | 80 | 85 | 90 | 95 |
| SBR1507 rubber | 30 | 20 | 15 | 10 | 5 |
| Nano zinc oxide | 2.5 | 3 | 3.5 | 4 | 5 |
| Stearic acid | 1.5 | 2.5 | 2 | 3 | 1.5 |
| Dispersant HT | 1.5 | 2 | 1.5 | 2.5 | 3 |
| White carbon black | 20 | 15 | 10 | 18 | 5 |
| N351 carbon black | 40 | 70 | 60 | 57 | 55 |
| Anti-aging agent DTPD | 1.5 | 2 | 1.8 | 3 | 1 |
| Anti-aging agent IPPD | 1.5 | 1 | 1.2 | 1 | 3 |
| Silane coupling agent NXT | 2 | 1.5 | 1 | 1.8 | 1 |
| |
1 | 1.5 | 2 | 2.5 | 3 |
| Insoluble sulfur OT7020 | 3 | 4 | 5 | 4 | 5 |
| Accelerant TBSI | 1 | 0.8 | 1 | 1 | 1.5 |
| Vulcanizing agent DTDM | 1 | 2 | 1.5 | 3 | 1 |
| Methylene donor RA65 | 2 | 3 | 4 | 5 | 6 |
The above raw materials play the following roles in the present application:
the function of compounding isoprene rubber and SBR1507 rubber is as follows: the processing property of the rubber material is improved, which is beneficial to the dispersion of the compounding agent, the tensile strength, the tearing strength, the wear resistance, the aging resistance and the like of the vulcanized rubber are improved, the heat generation of the vulcanized rubber is reduced, and the compression deformation of the vulcanized rubber is reduced.
The function of the nano zinc oxide is as follows: the activator and stearic acid have synergistic effect, the vulcanization speed of the sizing material is improved, the dosage can be reduced by 30-40% compared with the common zinc oxide, and the environment protection is facilitated.
The action of stearic acid; the activator and the stearic acid are matched for use, so that the synergistic effect is achieved, and the vulcanization speed of the rubber material is improved.
The function of a dispersant HT; improve the dispersion uniformity of the rubber material and shorten the mixing time.
Compounding white carbon black and carbon black N351; the wear resistance and the rebound resilience of the vulcanized rubber are improved, and the heat generation of the vulcanized rubber is reduced.
Compounding an anti-aging agent DTPD and an anti-aging agent IPPD; the anti-aging agent IPPD provides a necessary short-term protection effect, the anti-aging agent DTPD plays a long-term protection effect, the two types of p-phenylenediamine have a synergistic effect, and the heat aging resistance, the ozone aging resistance and the like of the vulcanized rubber are improved.
Effect of silane coupling agent NXT: the synergistic effect is achieved by matching with the white carbon black, the wear resistance of vulcanized rubber is improved, the heat generation and the hysteresis loss of the vulcanized rubber are reduced, the mixing time of rubber materials is reduced, and the Mooney viscosity is reduced.
Effect of resin A-250: the modified isoprene rubber is combined with white carbon black, a silane coupling agent NXT and a methylene donor RA65 to form a methyl-ethyl bonding system, so that the bonding strength of isoprene rubber and SBR1507 rubber is ensured to meet the use requirement on the one hand, and the bonding performance of a connecting interface between the rubber-protecting composition for the cushion tape mouth before vulcanization and the existing cushion tape rubber is ensured on the other hand; meanwhile, the heat generation of vulcanized rubber is reduced, and the wear resistance and the tear resistance of the vulcanized rubber are improved.
Effect of insoluble sulfur OT 7020: the rubber is dispersed in the rubber, so that the rubber material is free from blooming and has good viscosity, and the appearance quality of the protective rubber of the nozzle pad can be ensured.
Effect of accelerator TBSI: the rubber has the advantages of long scorching time, safe processing performance of rubber materials, high modulus of vulcanized rubber, reduced heat generation of the vulcanized rubber and improved wear resistance of the vulcanized rubber.
Effect of vulcanizing agent DTDM: the operation is safe, the rubber material can not be scorched, the modulus, hardness and wear resistance of vulcanized rubber are further improved, and the compression heat generation is reduced.
The preparation method of the tire pad nozzle rubber protecting composition described in the above embodiment 1, embodiment 2, embodiment 3, embodiment 4 and embodiment 5 comprises the following steps:
(1) first-stage mixing: adding isoprene rubber, SBR1507 rubber, nano zinc oxide, stearic acid, a dispersing agent HT, an anti-aging agent DTPD, an anti-aging agent IPPD, a silane coupling agent NXT, resin A-250 and a pressure bolt for 40s from a feeding port of an internal mixer; then lifting an upper top plug of the internal mixer, adding white carbon black and partial carbon black N351 from a feeding port of the internal mixer, and pressing the plug for 40 s; opening a discharge port of the internal mixer when the temperature of the rubber material in the internal mixer reaches 155 ℃, discharging the internal mixer rubber material, and cooling a lower sheet on an open mill, wherein the temperature is controlled at 18-45 ℃; the standing time is controlled to be 4-16 h, and a first-stage mixed rubber material is obtained;
(2) mixing in the second stage; adding the first-stage mixed rubber material obtained in the step (1) from a feeding port of an internal mixer, and pressing for 40 s; then lifting the upper top bolt of the internal mixer, adding the rest carbon black N351 from a feeding port of the internal mixer, and pressing the bolt for 40 s; opening a discharge port of the internal mixer when the temperature of the rubber material in the internal mixer reaches 155 ℃, discharging the internal mixer rubber material, and cooling a lower sheet on an open mill, wherein the temperature is controlled at 18-45 ℃; the standing time is controlled to be 4-16 h, and a two-stage mixed rubber material is obtained;
(3) three-stage sulfurization: adding the two-stage mixed rubber material obtained in the step (2) from a feeding port of an internal mixer, and pressing for 40 s; then lifting the top plug of the internal mixer, adding insoluble sulfur OT7020, an accelerator TBSI, a vulcanizing agent DTDM and a methylene donor RA65 from a feeding port of the internal mixer, and pressing for 40 s; opening a discharge port of the internal mixer when the temperature of the rubber material in the internal mixer reaches 100 ℃, discharging the internal mixer rubber material, and cooling a lower sheet on an open mill, wherein the temperature is controlled at 18-45 ℃; the standing time is controlled to be 8-96 h, and three sections of vulcanized rubber materials are obtained;
(4) film forming: adding the three sections of vulcanized rubber materials obtained in the step (3) into a cold feed extruder, extruding rubber sheets, and controlling the temperature to be 18-45 ℃; and controlling the parking time to be 4-24 h to obtain the tire pad nozzle rubber protecting composition.
In the step (1), the step (2) and the step (3), the rotor speed of the internal mixer is controlled to be 20-60 rpm, and the ram oil pressure on the internal mixer is controlled to be 0.4-0.6 MPa.
And (4) standing at room temperature after the open mill in the steps (1) to (3) cools and discharges the sheet and the cold feed extruder in the step (4) extrudes the sheet.
The type of the internal mixer is XM-270 internal mixer, and the type of the cold feed extruder is XJ-150.
And (3) testing physical and mechanical properties of vulcanized rubber: the tire cushion nozzle rubber-protecting compositions respectively prepared in the above examples 1 to 5 are vulcanized for 30min at 143 ℃, and the physical and mechanical performance test data of the vulcanized rubber are shown in the following table 2. The standard for testing the tensile strength, the tearing strength, the stress at definite elongation and the elongation at break is GB/T528-2009. The standard of the Shore A type hardness performance test is GB/T531.1-2008, the standard of the Akron abrasion loss performance test is GB/T1689-2014, the standard of the sizing material aging test strength retention rate performance test is GB/T3512-2001, and the strength retention rate is the tensile strength change rate. Since the tire pad nozzle rubber protecting composition is proposed for the first time by the company, the proportion is not in proportion.
Table 2: vulcanized rubber test data of tire pad rubber protecting composition with nozzle
As can be seen from the above table, the vulcanized rubber of the tire cushion cap rubber-protecting compositions prepared in the above examples 1 to 5 has a tensile strength of 18.9 to 21.3MPa, a tear strength of 89 to 112KN/m, a 300% stress at definite elongation of 12.5 to 14.2MPa, an elongation at break of 426 to 445%, a Shore A hardness of 82 to 90 degrees, and an Akron abrasion loss of 0.07 to 0.12cm3The strength retention rate is 91-96%. In summary, the vulcanizate prepared in example 4 has better physical and mechanical properties.
And (3) durability test: according to the matched tires with different specifications, tire cushion belt molds with different specifications are selected, the tire cushion belt mouth rubber protecting composition prepared by the method is respectively sheared and adhered to the positions of the cushion belt mouth holes on the cushion belt rubber, at the moment, the cushion belt mouth rubber protecting composition and the cushion belt rubber belong to unvulcanized rubber, the cushion belt mouth rubber protecting composition and the cushion belt are adhered together by the viscoelasticity of the rubber, then the steps of rubber loading, mold closing and vulcanization are carried out according to the vulcanization process of the tire cushion belt, after the vulcanization is finished, the tire cushion belt is taken out, the cushion belt with the specification corresponding to the tires with different specifications is obtained, and as shown in figures 1-4, the position of the cushion belt mouth 2 of the existing cushion belt 1 is connected with a ring-shaped cushion belt mouth rubber protecting 3. The tire rim strip nozzle rubber protection compositions prepared in the examples 1 to 5 are respectively prepared into rim strips matched with 11.00R20 standard tires according to the method, and are respectively assembled to 5 qualified 11.00R20 standard tires; for comparison, the rim strips equipped with the existing metal shims were fitted to 2 acceptable 11.00R20 gauge tires, respectively, and a durability test was performed according to the following test method, at a speed of 65Km/h, for a period of 47h, and at a load rate of 100%; the time of the second stage is 10h, and the load rate is 110 percent; the time of the third stage is 10h, and the load factor is 120 percent; the fourth stage time is 10h, and the load factor is 130; the fifth stage time was 10 hours and the load factor was 140% until the tire ran out. The test results are shown in Table 3:
table 3: durability test result of tire pad with nozzle rubber-protecting composition
As can be seen from table 3 above, in the very severe durability test, the appearance quality of the rim strip and the mouth rubber protector part of the rim strip of the tire rim strip mouth rubber protector composition prepared in the above examples 1 to 5 is normal, and the phenomenon of wear failure of the mouth rubber protector and the phenomenon of interface phase separation between the rim strip and the mouth rubber protector do not occur.
And (3) actual mileage test: the tire rim strip nozzle rubber-protecting compositions prepared in the above examples 1 to 5 are respectively prepared into rim strips matched with 11.00R20 standard tires according to the preparation method, and are assembled on 11.00R20 standard tires and five liberation automobiles respectively; for comparison, two identical liberation cars were selected, which were fitted with 11.00R20 gauge certified tires of metal shim fitted flaps; the 7 liberation automobile standard cargo capacity 40 tons of tires run for 22 kilometers in total, the inspection result is that the appearance of the cushion belt assembled with the application is normal, the mouth rubber protecting part of the cushion belt is normal, and the metal gasket of the tire assembled with the cushion belt of the metal gasket is damaged.
In the prior art, an external metal gasket is arranged at a nozzle hole of a pad belt, the pad belt is made of elastic rubber materials, and the metal gasket is made of rigid materials. The running process of the tire is a dynamic process, and each part of the tire has flexural deformation and serves as a rigid metal gasket, so that the tire is easily broken due to external force; on the other hand, the joint of the edge of the metal gasket and the cushion belt at the nozzle hole of the cushion belt is also continuously bent and stretched, so that the hidden danger that the outer tire or the cushion belt is cut by the edge of the metal gasket or the broken section exists, and the use of the outer tire or the cushion belt is influenced. And this application adopts to connect at the mouth hole position of rim strip and sets up rim strip mouth and protect gluey, and rim strip mouth protect gluey belong to elastic rubber material, at the tire in-process of traveling, can cushion external force jointly, the effectual life who prolongs the rim strip.
At present, in the installation process of the rim strip, although the direct contact between the existing metal gasket and the valve can be avoided, in the daily use or maintenance process of the tire, the inevitable displacement of the inner tube results in the direct contact between the valve on the inner tube and the metal gasket, the metal gasket and the valve belong to rigid materials, and in the driving process of a vehicle, the continuous abrasion of the valve on the metal gasket by the inner tube is generated, so that the valve on the inner tube is damaged, and the service life of the rim strip is also shortened seriously. The rubber for protecting the pad nozzle has the advantages of high strength, high hardness, high wear resistance and the like, is a rubber high-elasticity material, and effectively prolongs the service life of the pad belt compared with a rigid metal gasket.
When an automobile runs, the tire tread at the ground contact part is pressed to generate large deformation, so that the air in the tire is compressed greatly, the gas theory shows that the compression can release heat of the air, the continuous heat release can cause the heat accumulation to rise, and the temperature of the tire rises, but the temperature of the tire generally does not rise continuously after rising to a constant value due to the cooling of the air, under the normal condition, the temperature of the tire during working is generally between 40 and 80 ℃, and the running temperature in summer or at high speed for a long time can reach 110 ℃. The tyre is used as the only part of the automobile which is contacted with the ground, and during the daily running of the automobile, muddy water, rainwater and other sewage enter a gap between the tyre valve and the wheel rim and are soaked on the surface of the metal gasket. The metal gasket is in the high-temperature and sewage environment for a long time, high-temperature oxidation and hot corrosion inevitably occur, and the rubber protection of the cushion belt nozzle is a rubber high-elasticity material, so that the cushion belt nozzle has corrosion resistance and good thermal-oxidative aging resistance, and the service life of the cushion belt is effectively prolonged.
In addition, before vulcanizing the cushion belt, the tire cushion belt nozzle rubber protecting composition is bonded at the position of the cushion belt nozzle hole on the cushion belt rubber, and the tire cushion belt nozzle rubber protecting composition is filled in a mold and vulcanized, so that the inside of the cushion belt rubber, the inside of the cushion belt nozzle rubber protecting composition and the rubber molecular chain between the cushion belt rubber and the cushion belt nozzle rubber protecting composition are crosslinked and vulcanized into a whole.
The tire rim nozzle rubber protection composition of the present invention is used in combination with the conventional rim rubber, for example, the conventional rim rubber using natural rubber, styrene-butadiene rubber, isoprene rubber or butadiene rubber as raw rubber system, and is particularly suitable for the conventional rim rubber using isoprene rubber as main raw rubber. The application can be used as the cushion belt mouth rubber protection of the heavy duty pneumatic tire.
However, the above description is only exemplary of the present invention, and the scope of the present invention should not be limited thereby, and the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should be covered by the claims of the present invention.
Claims (6)
1. The tire pad nozzle rubber protection composition is characterized by comprising the following raw materials in parts by weight:
70-95 parts of isoprene rubber, 5-30 parts of SBR1507 rubber, 2.5-5 parts of nano zinc oxide, 1.5-3 parts of stearic acid, 1.5-3 parts of a dispersing agent HT, 5-20 parts of white carbon black, 40-70 parts of carbon black N351, 1-3 parts of an anti-aging agent DTPD, 1-3 parts of an anti-aging agent IPPD, 1-2 parts of a silane coupling agent NXT, 1-3 parts of resin A-250, 3-5 parts of insoluble OT7020, 0.8-1.5 parts of a promoter TBSI, 1-3 parts of a vulcanizing agent DTDM and 2-6 parts of a methylene donor RA 65; wherein the total parts of the isoprene rubber and the SBR1507 rubber are 100 parts.
2. The tire pad nozzle rubber protecting composition according to claim 1, wherein the raw materials comprise the following components in parts by weight:
80-95 parts of isoprene rubber, 5-20 parts of SBR1507 rubber, 3-5 parts of nano zinc oxide, 1.5-3 parts of stearic acid, 2-3 parts of a dispersing agent HT, 5-18 parts of white carbon black, 55-70 parts of carbon black N351, 1-3 parts of an anti-aging agent DTPD, 1-3 parts of an anti-aging agent IPPD, 1-1.8 parts of a silane coupling agent NXT, 1.5-3 parts of resin A-250, 4-5 parts of insoluble OT7020, 0.8-1.5 parts of a promoter TBSI, 1-3 parts of a vulcanizing agent DTDM and 3-6 parts of a methylene donor RA 65.
3. The tire pad nozzle rubber protecting composition as claimed in claim 2, wherein the raw materials comprise the following components in parts by weight:
90 parts of isoprene rubber, 10 parts of SBR1507 rubber, 4 parts of nano zinc oxide, 3 parts of stearic acid, 2.5 parts of a dispersing agent HT, 18 parts of white carbon black, 57 parts of carbon black N351, 3 parts of an anti-aging agent DTPD, 1 part of an anti-aging agent IPPD, 1.8 parts of a silane coupling agent NXT, 2.5 parts of resin A-250, 4 parts of insoluble sulfur OT7020, 1 part of an accelerator TBSI, 3 parts of a vulcanizing agent DTDM and 5 parts of a methylene donor RA 65.
4. The method for preparing the tire cushion nozzle rubber-protecting composition according to any one of claims 1 to 3, comprising the following steps:
(1) first-stage mixing: adding isoprene rubber, SBR1507 rubber, nano zinc oxide, stearic acid, a dispersing agent HT, an anti-aging agent DTPD, an anti-aging agent IPPD, a silane coupling agent NXT, resin A-250 and a pressure bolt for 40s from a feeding port of an internal mixer; then lifting an upper top plug of the internal mixer, adding white carbon black and partial carbon black N351 from a feeding port of the internal mixer, and pressing the plug for 40 s; opening a discharge port of the internal mixer when the temperature of the rubber material in the internal mixer reaches 155 ℃, discharging the internal mixer rubber material, and cooling a lower sheet on an open mill, wherein the temperature is controlled at 18-45 ℃; standing for 4-16 h to obtain a first-stage mixed rubber material;
(2) mixing in the second stage; adding the first-stage mixed rubber material obtained in the step (1) from a feeding port of an internal mixer, and pressing for 40 s; then lifting the upper top bolt of the internal mixer, adding the rest carbon black N351 from a feeding port of the internal mixer, and pressing the bolt for 40 s; opening a discharge port of the internal mixer when the temperature of the rubber material in the internal mixer reaches 155 ℃, discharging the internal mixer rubber material, and cooling a lower sheet on an open mill, wherein the temperature is controlled at 18-45 ℃; standing for 4-16 h to obtain a two-stage mixed rubber material;
(3) three-stage sulfurization: adding the two-stage mixed rubber material obtained in the step (2) from a feeding port of an internal mixer, and pressing for 40 s; then lifting the top plug of the internal mixer, adding insoluble sulfur OT7020, an accelerator TBSI, a vulcanizing agent DTDM and a methylene donor RA65 from a feeding port of the internal mixer, and pressing for 40 s; opening a discharge port of the internal mixer when the temperature of the rubber material in the internal mixer reaches 100 ℃, discharging the internal mixer rubber material, and cooling a lower sheet on an open mill, wherein the temperature is controlled at 18-45 ℃; standing for 8-96 h to obtain three sections of vulcanized rubber materials;
(4) film forming: adding the three sections of vulcanized rubber materials obtained in the step (3) into a cold feed extruder, extruding rubber sheets, and controlling the temperature to be 18-45 ℃; standing for 4-24 h to obtain the tire pad nozzle rubber protecting composition.
5. The method for preparing the tire pad nozzle rubber protecting composition according to claim 4, wherein in the step (1), the step (2) and the step (3), the rotor speed of the internal mixer is 20-60 rpm, and the ram oil pressure on the internal mixer is 0.4-0.6 MPa; the tire pad nozzle rubber protection composition is prepared into tire pad nozzle rubber protection through vulcanization, and the tire pad nozzle rubber protection is of an annular structure.
6. The method for preparing the tire cushion with the mouth rubber protecting composition as claimed in claim 4, wherein the internal mixer is XM-270 internal mixer, and the cold feed extruder is XJ-150.
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| CN201910593395.3A CN110183746B (en) | 2019-07-03 | 2019-07-03 | Tire cushion rubber protecting composition with nozzle and preparation method thereof |
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| JP2016199695A (en) * | 2015-04-13 | 2016-12-01 | 横浜ゴム株式会社 | Rubber composition for tire |
| CN106279840A (en) * | 2016-08-26 | 2017-01-04 | 四川远星橡胶有限责任公司 | A kind of tire formulation and preparation method thereof |
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| JP2010126672A (en) * | 2008-11-28 | 2010-06-10 | Yokohama Rubber Co Ltd:The | Rubber composition for tire tread |
| CN103140549A (en) * | 2011-06-21 | 2013-06-05 | 住友橡胶工业株式会社 | Rubber composition for tire insulations and tire using same |
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Address after: 148 Longshan road Wendeng Weihai Shandong 264200 Patentee after: Weihai JIAHANG Rubber Technology Co.,Ltd. Address before: 148 Longshan road Wendeng Weihai Shandong 264200 Patentee before: WENDENG SANFENG TYRE Co.,Ltd. |