CN114456744A - Tire self-repairing sealant adhered with mute cotton, tire and tire manufacturing method - Google Patents
Tire self-repairing sealant adhered with mute cotton, tire and tire manufacturing method Download PDFInfo
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- CN114456744A CN114456744A CN202210060799.8A CN202210060799A CN114456744A CN 114456744 A CN114456744 A CN 114456744A CN 202210060799 A CN202210060799 A CN 202210060799A CN 114456744 A CN114456744 A CN 114456744A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J123/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
- C09J123/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
- C09J123/22—Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefines
-
- 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
- B60C19/00—Tyre parts or constructions not otherwise provided for
- B60C19/002—Noise damping elements provided in the tyre structure or attached thereto, e.g. in the tyre interior
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
-
- 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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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Abstract
The invention relates to the technical field of tire manufacturing, in particular to a tire self-repairing sealant for adhering silent cotton, a tire and a tire manufacturing method. The tire self-repairing sealant comprises 200-500 parts by weight of polyisobutylene rubber; halogenated butyl rubber: 80-100 parts by weight; carbon black: 10-80 parts by weight; resin: 5-50 parts by weight of processing oil: 10-40 parts by weight; zinc oxide: 2-10 parts by weight; a bridging agent: 5-15 parts by weight; sulfur: 0.5 to 2.0 parts by weight; accelerator DM: 0.5 to 2.0 parts by weight; accelerator TB 710: 0 to 2 parts by weight. The tire self-repairing sealant ensures the processing flow property when the rubber material is coated, and also gives consideration to the adhesion effect of the mute cotton.
Description
Technical Field
The invention relates to the technical field of tire manufacturing, in particular to a tire self-repairing sealant for adhering silent cotton, a tire and a tire manufacturing method.
Background
In the driving process of an automobile, once a tire is punctured, a spare tire needs to be replaced or the automobile needs to wait for rescue, and when the tire is punctured, the tire is punctured or even turned over seriously, so that the personal safety of passengers is seriously affected. In order to solve the trouble caused by tire puncture, self-repairing tires are developed by various tire enterprises. At present, almost all self-sealing rubber materials on the market mainly comprise black rubber materials, so that consumers are not easy to find the outflow of the self-sealing rubber layers of the tires after the tires are punctured, and hidden dangers are buried for the safety of the tires.
As the comfort of the vehicle is increasingly emphasized by consumers, and the tire noise has become one of the main factors affecting the comfort of the vehicle under the vigorous development of new energy vehicles. The tire noise is mainly caused by the fact that air inside a tire cavity resonates due to tire vibration when the tire rotates and contacts with an uneven road surface. When the resonant frequency reaches a certain hertz, discomfort may be caused to the driver or passengers. Therefore, reducing tire noise has become an important consumer demand for vehicle comfort.
The noise generated when the tire is running is generally composed of external noise such as pattern noise and road noise, and internal cavity noise. Tire cavity noise is excited by road surface input and is caused by the resonance of the ultra low pressure acoustic system consisting of tires and disc wheels, and is also commonly referred to as tire resonance. The cavity noise frequency is between 200 Hz and 300Hz, and is determined by the structure of the tire cavity.
Attaching a silencer made of a spongy material in a cavity inside a tire is a known method of reducing the noise of the cavity. The sponge sound-absorbing cotton is used as the action mechanism of the silencer, and the sound-absorbing cotton is internally provided with a plurality of micropores formed by air, so that sound waves can be buffered and absorbed, and the sound waves are difficult to reflect on the plane of the sound-absorbing cotton. Therefore, in the prior patent, the density of the sound absorption cotton is strictly regulated, and as the density of the sound absorption cotton is regulated in patent CN110395976A, the density of the sound absorption cotton needs to be between 40g/m3 and 50kg/m3, or the effective effect cannot be achieved. However, the method still has a larger improvement on the reduction degree of the cavity noise. Because the frequency of the cavity noise is between 200-300Hz, and the pore diameter of the polyurethane used as the sound absorbing cotton material is generally fixed after foaming, it is difficult to eliminate the sound wave in the whole frequency range.
The Chinese patent application (publication No. CN110733298A Kokai: 20200131) discloses a tire noise reduction device, which is mainly characterized in that a noise reduction structure is arranged on the inner surface of a tire cavity in a tire, the noise reduction structure is provided with at least one sound absorbing material, the sound absorbing material penetrates through the tire cavity to form a hollow air chamber, the sound absorbing material comprises a binding surface which is stuck on the inner surface of the tire and a through surface, and a channel is arranged on the through surface and is used for communicating the air chamber and facing the center of the tire; because the sound-absorbing material is provided with the air chamber, the sound waves generate energy to offset and attenuate, and the tire cavity resonance sound is effectively reduced. However, in the through passage of the communicating air chamber in the patent, reflection and superposition of sound waves are formed, and the sound attenuation effect is weakened. Thus, the structure is still more space-optimized for noise reduction.
Therefore, the applicant applies Chinese invention patent application (application number: 2021104977114, application date: 2021-05-08) and discloses a tire noise reduction system, which comprises a pneumatic tire with a cavity, wherein the pneumatic tire is provided with a tread part, a bead part and a sidewall part, the inner wall of the tread part is provided with strip-shaped sound-absorbing cotton in a bonding mode through an adhesive, the adhesive is a self-repairing rubber coating with the functions of puncture resistance, repair prevention and adhesion of the sound-absorbing cotton, the width of the self-repairing rubber coating is 50% -130% of the width of the tread, and the thickness of the self-repairing rubber coating is 0.5-3.5 mm. The self-repairing rubber coating that this application adopted has good adhesion performance, can inhale the sound cotton firm absorption in tire internal surface with the banding, and the self-repairing rubber coating of this application contains the self-repairing composition in addition, and when the tire was punctureed, the self-repairing composition can permeate into the gas leakage position fast, blocks up and restores the gas leakage hole with the gas leakage hole. However, the traditional adhesives have poor adhesion effect and processing flow property during coating.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a tire self-repairing sealant for adhering silent cotton, which ensures the processing flow performance when a sizing material is coated and also considers the adhesion effect of the silent cotton.
In order to achieve the purpose, the invention adopts the following technical scheme:
the tire self-repairing sealant for adhering the mute cotton comprises the following components in percentage by mass:
polyisobutylene rubber: 200 to 500 parts by weight;
halogenated butyl rubber: 80-100 parts by weight;
carbon black: 10-80 parts by weight;
c5 petroleum resin: 5 to 50 parts by weight of a stabilizer,
processing oil: 10-40 parts by weight;
zinc oxide: 2-10 parts by weight;
a bridging agent: 5-15 parts by weight;
sulfur: 0.5 to 2.0 parts by weight;
accelerator DM: 0.5 to 2.0 parts by weight;
accelerator TB 710: 0 to 2 parts by weight.
Preferably, the tire self-repairing sealant consists of the following components in percentage by mass:
polyisobutylene rubber: 300 to 450 parts by weight;
halogenated butyl rubber: 80-100 parts by weight;
carbon black: 30-60 parts by weight;
c5 petroleum resin: 25 to 45 parts by weight of a stabilizer,
processing oil: 20-35 parts by weight;
zinc oxide: 5.0 to 8.0 parts by weight;
a bridging agent: 8-12 parts by weight;
sulfur: 1.0 to 2.0 parts by weight;
accelerator DM: 1.0 to 1.5 parts by weight;
accelerator TB 710: 1.0 to 2 parts by weight.
The invention further discloses a preparation method of the tire self-repairing sealant, which comprises the following steps:
step 1, adding halogenated butyl rubber, carbon black, C5 petroleum resin and processing oil into an internal mixer by using a rubber internal mixer for fully mixing to prepare sulfur-free rubber compound;
and 3, adding the vulcanized rubber compound prepared in the last step into a screw extruder for cold feeding, adding polyisobutylene rubber into the extruder at three liquid injection positions of the screw according to a ratio, and mixing the polyisobutylene rubber compound with the vulcanized rubber compound to prepare the tire self-repairing sealant.
Preferably, the mixing temperature of the rubber internal mixer in the step 1) is 100-150 ℃, and preferably 120-135 ℃; the processing temperature of the rubber material extruder in the step 2) is 80-140 ℃, and preferably 90-110 ℃.
The invention further discloses a self-repairing tire using the silencing cotton of the silencing cavity, wherein the tire body comprises a tread part, a sidewall part and a bead part, a self-repairing rubber coating is arranged on the inner wall of the tread along the circumferential direction of the section, and the central position of the coating is provided with the strip-shaped silencing cotton; the self-repairing rubber coating adopts the tire self-repairing sealant.
Preferably, the width of the self-repairing rubber coating is 50-130% of the width of the tread, the thickness of the self-repairing rubber coating is 0.5-5.0 mm, and the thickness of the self-repairing rubber coating is preferably 2.0-3.0 mm; the width of the self-repairing sizing material coating is set to be 100-200% of the width of the contact surface of the self-repairing sizing material coating and the mute cotton.
Preferably, the impregnation depth of the self-repairing sizing material coating impregnated in the strip-shaped mute cotton is 0.5-3.0 mm, and preferably 0.5-1.5 mm.
Preferably, more than one continuous annular hole is formed in the strip-shaped silencing cotton along the circumferential direction, the strip-shaped silencing cotton is connected end to end, and the annular holes are also connected end to form an annular main silencing cavity which is not communicated with the inner cavity of the tire; the strip-shaped silencing cotton is a spongy porous material prepared by foaming a high polymer material, the apparent density is 5kg/m3-10kg/m3, and the strip-shaped silencing cotton is provided with a large number of porous silencing cavities; the side wall of the annular hole is communicated with the plurality of holes of the strip-shaped silencing cotton, so that the annular main silencing cavity is communicated with the plurality of porous silencing cavities.
Preferably, a line connecting the center of gravity of the annular hole and the center of the tire tread is perpendicular to a center auxiliary line where the section width of the tire is located.
Preferably, the annular hole accounts for 10-40% of the right cross-sectional area of the strip-shaped silencing cotton, and preferably accounts for 20% -30%.
Preferably, the radial height of the tire between the bead base line and the equator point of the tire cavity is defined as the height Hc of the tire cavity and the thickness Hs of the belt-shaped silencing cotton, and the height Hs is more than 20mm and less than 0.2 multiplied by Hc; the radius of the circumcircle of the right section of the annular hole is the radius Rs of the center of the circle, and the Rs is more than 4.5mm and less than 0.5Hs-1 mm.
Further, the invention also discloses a manufacturing method of the self-repairing tire, which comprises the following steps:
step 1, carrying out high-energy laser cleaning, mechanical scraping cleaning or chemical reagent cleaning on the inner surface of the vulcanized tire, preferably carrying out high-energy laser cleaning, eliminating the components of a vulcanizing capsule isolating agent on the surface of an inner layer rubber material, and ensuring the combination effect of silent cotton with a silencing cavity and the inner layer rubber material;
and 2, performing a coating process by using self-repairing coating equipment, and circumferentially coating the prepared self-repairing inner layer rubber material on the inner surface of the tread, wherein the coating center line is superposed with the tire center line, and the coating width is 90-120% of the width of the widest belt.
Step 3, performing coating appearance inspection, and attaching the mute cotton using the silencing cavity on the surface of the self-repairing rubber material by using mute cotton full-automatic attaching equipment after the tire is parked for more than 30 minutes;
and 4, detecting the dynamic balance uniformity of the tire.
Preferably, the laser cleaning processing power in the step 1) is 200-500 kW, and more preferably 300-400 kW.
The invention has the main advantages that:
1. compared with the traditional silent cotton tire, the self-repairing rubber material is used as the traditional silent cotton bonding glue, so that the bonding area between the silent cotton and the inner layer of the tire is increased, the adhesion effect of the silent cotton is improved, the risk that the silent cotton falls off in the long-term use process is avoided, and the service life of the silent cotton tire is prolonged.
2. Compared with the traditional silent cotton tire, the tire inner layer is circumferentially coated with the self-repairing rubber material, so that the tire can be free from repairing after being punctured, the problem that the sound absorption effect of the silent cotton is influenced because the silent cotton at the air leakage position is damaged by tire repairing is avoided, and the problem that the tire repairing of the traditional silent cotton tire is difficult is solved.
3. Compared with the traditional silent cotton tire, the silent cotton tire has the advantages that the silent cotton used in the silent cotton tire is provided with the holes at the center, the tangent plane of the silent cotton is in an isosceles trapezoid shape, the internal space structure of the silent cotton is increased, and the sound absorption effect of the silent cotton tire is improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The following describes a detailed embodiment of the present invention with reference to the accompanying drawings.
Example 1
The self-repairing sealant comprises the following components in percentage by mass: polyisobutylene rubber: 400 parts by weight; halogenated butyl rubber: 100 parts by weight; carbon black: 40 parts by weight; c5 petroleum resin: 30 parts by weight, processing oil: 30 parts by weight; zinc oxide: 6.25 parts by weight; di-tert-butylperoxytrimethylcyclohexane: 10 parts by weight; sulfur: 1.5 parts by weight; 1.25 parts of accelerator DM and 7101.5 parts of accelerator TB.
The method for manufacturing the self-repairing tire comprises the following steps:
1) 100 parts of halogenated butyl rubber, 40 parts of carbon black, 30 parts of resin and 30 parts of processing oil are added into an internal mixer for fully mixing to prepare the sulfur-free rubber compound.
2) Adding the sample prepared in the last step, 1.5 parts of sulfur, 10 parts of bridging agent, 1.25 parts of accelerator DM, 7101.5 parts of accelerator TB and 6.25 parts of zinc oxide into an internal mixer for further mixing to prepare vulcanized rubber compound for later use;
3) and adding the vulcanized rubber compound prepared in the last step into a screw extruder for cold feeding, adding 400 parts of polyisobutylene rubber into the extruder at three liquid injection positions of the screw according to a ratio, and mixing the polyisobutylene rubber compound with the vulcanized rubber compound to prepare a sample 1.
The invention relates to a processing method of a self-repairing rubber material, which comprises the following steps: firstly, a rubber internal mixer is used for mixing halogenated butyl rubber, natural rubber, carbon black, C5 petroleum resin, processing oil and a vulcanizing agent to prepare the self-repairing master batch, and the rubber discharge temperature is not more than 100 ℃. Mixing the butyl masterbatch and the polyisobutylene rubber by using a screw extruder to prepare a self-repairing inner layer rubber material, wherein the extrusion temperature is not more than 100 ℃; the polyisobutylene rubber accounts for 50 to 75 percent of the total part to ensure the processing flow property of the sizing material during coating, and when the proportion is less than 50 percent, the flow property is poor during coating to influence the processing property; when the proportion is higher than 75%, the size change rate of the coated self-repairing adhesive layer in the parking process is large.
The rheological properties of the self-healing masterbatch are shown in table 1.
Table 1 rheological Property data
The physical properties of the self-healing masterbatch are shown in table 2:
TABLE 2 physical Property data
As can be seen from the data in tables 1 and 2, the self-sealing masterbatch is a low-strength high-elongation rubber material and is difficult to blend with a large amount of liquid rubber in conventional internal mixer equipment.
Therefore, the self-repairing master batch and the polyisobutylene rubber are mixed to prepare a self-repairing inner layer rubber material by using a screw extruder, and the extrusion temperature does not exceed 100 ℃; the polyisobutylene rubber accounts for 50 to 75 percent of the total part to ensure the processing flow property of the sizing material during coating, and when the proportion is less than 50 percent, the flow property is poor during coating to influence the processing property; when the proportion is higher than 75%, the size change rate of the coated self-repairing adhesive layer in the parking process is large.
Comparative example 1
1) 90 parts of halogenated butyl rubber, 10 parts of natural rubber, 40 parts of carbon black, 30 parts of resin and 30 parts of processing oil are added into an internal mixer to be fully mixed, and the sulfur-free rubber compound is prepared.
2) Adding the sample prepared in the last step, 1.5 parts of sulfur, 10 parts of bridging agent, 1.25 parts of accelerator DM, 7101.5 parts of accelerator TB and 6.25 parts of zinc oxide into an internal mixer for further mixing to prepare vulcanized rubber compound for later use;
3) and adding the vulcanized rubber compound prepared in the last step into a screw extruder for cold feeding, adding 400 parts of polyisobutylene rubber into the extruder at three liquid injection positions of the screw according to a ratio, and mixing the polyisobutylene rubber compound with the vulcanized rubber compound to prepare a sample 2.
Comparative example 2
1) Adding 85 parts of butyl rubber, 15 parts of high-molecular polyisobutylene, 35 parts of zinc oxide and 25 parts of resin into an internal mixer for fully mixing to obtain the rubber compound.
2) And adding the rubber compound prepared in the last step into a screw extruder for cold feeding, adding 200 parts of low-molecular-weight polyisobutylene rubber into the extruder at three liquid injection positions of the screw according to a ratio, and mixing the low-molecular-weight polyisobutylene rubber with the vulcanized rubber compound to obtain a sample 3.
Example 2
The self-repairing tire using the silencing cotton with the silencing cavity as shown in FIG. 1 comprises a pneumatic tire with a cavity, wherein the pneumatic tire is provided with a tread part 1, a bead part 3 and a sidewall part 2, the inner wall of the tread part 1 is provided with a strip-shaped sound-absorbing cotton 4 in a bonding mode through a self-repairing sealant 5, the width of a coating of the self-repairing sealant 5 is set to be 120% of the width of the tread, and the thickness of the coating is 1.5 mm; the width of the coating of the self-repairing sealant 5 is set to be 150 percent of the width of the contact surface of the self-repairing sealant and the mute cotton. The impregnation depth of the coating of the self-repairing sealant 5 impregnated in the strip-shaped mute cotton 4 is set to be 2 mm. The strip-shaped sound-absorbing cotton 4 is a spongy porous material prepared by foaming polyurethane, and the apparent density of the strip-shaped sound-absorbing cotton 4 is 10kg/m3The height of the square tire cavity of the strip-shaped sound-absorbing cotton 4 is 41mm in the right section, and the thickness Hs of the sound-absorbing cotton is 30 mm. The strip-shaped sound-absorbing cotton 4 is provided with a continuous annular hole 6 along the circumferential direction, the right section of the annular hole 6 is circular, the section of the annular hole accounts for 30% of the area of the right section of the strip-shaped sound-absorbing cotton, and the radius of the circle is Rs and is 8 mm. The connecting line of the center of gravity of the annular hole 6 and the center of the tire tread is vertical to the center auxiliary line of the section width of the tire. The strip-shaped sound-absorbing cotton 4 is connected end to end, and the annular hole 6 is also connected end to form an annular main sound-absorbing cavity which is not communicated with the inner cavity of the tire; the side wall of the annular hole 6 is communicated with the plurality of holes of the strip-shaped sound absorption cotton 4, so that the annular main silencing cavity is communicated with a plurality of porous silencing cavities.
The invention carries out high-energy laser treatment on the inner surface of the vulcanized tire, eliminates the components of the vulcanizing capsule separant on the surface of the inner layer rubber material at the laser cleaning processing power of 350kw, and ensures the combination effect of the silent cotton with the silencing cavity and the inner layer rubber material; and (3) carrying out a coating process by using self-repairing coating equipment, and circumferentially coating the prepared self-repairing inner layer rubber material on the inner surface of the tread, wherein the coating center line is superposed with the center line of the tire and the coating width is 90-120% of the width of the widest belt. Performing coating appearance inspection, and attaching the mute cotton using the silencing cavity on the surface of the self-repairing rubber material by using mute cotton full-automatic attaching equipment after the tire is parked for more than 30 minutes; and then detecting the dynamic balance uniformity of the tire.
The traditional mechanical polishing and cleaning process has the defects that the polishing thickness and width cannot be accurately controlled, and the uniformity of circumferential polishing thickness and radial polishing width is poor. The high-energy laser cleaning process used in the invention treats the residual separant component after vulcanization of the airtight layer at high temperature, and ensures that the self-repairing rubber material is not separated after coating, thereby influencing the service performance of the tire; meanwhile, the effective thickness of the tire air-tight layer and the tire body cord fabric are protected to the maximum extent, and the service life of the tire is not influenced.
The invention relates to a self-repairing glue material coating method which comprises the following steps: the self-repairing rubber material is heated by a self-sealing coating device through four parts, namely a heating pump, a conveying pipe, a liquid injection pump, a liquid injection pipe and a nozzle, so that the self-repairing rubber material is converted from a solid state into a viscous state, the viscous state self-repairing rubber material is uniformly coated according to the circumferential direction to the required width according to the contour width sizes in different tire specifications, the coating center line is superposed with the tire center line, and the coating width is 90% -120% of the width of the widest belted layer.
The invention relates to a mute cotton attaching processing method which comprises the following steps: the mute cotton with the required length is automatically cut by mute cotton attaching equipment according to the perimeter of the inner contour of the tire specification, and then the cut mute cotton is attached to the surface of the self-repairing rubber material by a manipulator and mechanically pressed. The three-in-one combination of the width center line of the mute cotton, the width center line of the self-repairing rubber material and the width center line of the tire section is ensured.
The invention relates to a method for evaluating the bonding effect of mute cotton and a self-repairing rubber material, which comprises the steps of cutting the mute cotton and a rubber sheet into sample pieces with the width of 20-60 mm, coating the surface of the rubber sheet with the self-repairing rubber material, pressing the mute cotton sample pieces, the self-repairing rubber material and the rubber sheet by using a roller, fixing the mute cotton and the rubber sheet by using two ends of a clamp of a tensile machine after standing for 4 hours at room temperature, carrying out a peeling test, and finally judging the bonding effect by referring to a table 3 according to the peeling state.
TABLE 3 self-repairing adhesive material adhesion rating evaluation table
TABLE 4 Peel test results of the size of example 1, comparative examples 1 and 2 after adhering to the mute cotton
| Kind of sample | Adhesion rating |
| Example 1 | A |
| Comparative example 1 | B |
| Comparative example 2 | B |
The bonding capacity is mainly related to the green strength and the wetting capacity of the self-repairing rubber material, the green strength is improved and the wetting capacity is reduced by adding the natural rubber, compared with the embodiment 1 in which 10 parts of natural rubber is used for replacing halogenated butyl rubber, the improvement of the green strength reduces the wetting capacity, the combination degree with the silent cotton is reduced, and the bonding grade is reduced. Example 1 compared with comparative example 2, the use of the high molecular weight polyisobutylene rubber improves the wetting ability of the compound, but the green strength is reduced, and the adhesion grade is reduced compared with example 1, and meanwhile, because the green strength of comparative example 2 is too low, the adhesion grade is further reduced because the high-temperature environment in the tire displaces the compound of comparative example 2 during the high-speed running process of the tire.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention, including any reference to the above-mentioned embodiments. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The tire self-repairing sealant adhered with the mute cotton is characterized by comprising the following components in percentage by mass:
polyisobutylene rubber: 200 to 500 parts by weight;
halogenated butyl rubber: 80-100 parts by weight;
carbon black: 10-80 parts by weight;
c5 petroleum resin: 5 to 50 parts by weight of a stabilizer,
processing oil: 10-40 parts by weight;
zinc oxide: 2-10 parts by weight;
a bridging agent: 5-15 parts by weight;
sulfur: 0.5 to 2.0 parts by weight;
accelerator DM: 0.5 to 2.0 parts by weight;
accelerator TB 710: 0 to 2 parts by weight.
2. The tire self-repairing sealant adhered with the mute cotton as claimed in claim 1, which is characterized by comprising the following components in percentage by mass:
polyisobutylene rubber: 300 to 450 parts by weight;
halogenated butyl rubber: 80-100 parts by weight;
carbon black: 30-60 parts by weight;
c5 petroleum resin: 25 to 45 parts by weight of a stabilizer,
processing oil: 20-35 parts by weight;
zinc oxide: 5.0 to 8.0 parts by weight;
a bridging agent: 8-12 parts by weight;
sulfur: 1.0 to 2.0 parts by weight;
accelerator DM: 1.0 to 1.5 parts by weight;
accelerator TB 710: 1.0 to 2 parts by weight.
3. The preparation method of the tire self-repairing sealant as claimed in claim 1 or 2, which is characterized by comprising the following steps:
step 1, adding halogenated butyl rubber, carbon black, C5 petroleum resin and processing oil into an internal mixer by using a rubber internal mixer for fully mixing to prepare sulfur-free rubber compound;
step 2, adding the sulfur-free rubber compound prepared in the last step, sulfur, bridging agent, accelerator DM, accelerator TB710 and zinc oxide into an internal mixer for further mixing to prepare a sulfur-added rubber compound for later use;
and 3, adding the vulcanized rubber compound prepared in the last step into a screw extruder for cold feeding, and mixing the vulcanized rubber compound with the vulcanized rubber compound to prepare the tire self-repairing sealant.
4. The method according to claim 3, characterized in that the mixing temperature of the sizing material internal mixer in step 1) is 100 to 150 ℃, preferably 120 to 135 ℃; the processing temperature of the rubber material extruder in the step 2) is 80-140 ℃, and preferably 90-110 ℃.
5. A self-repairing tire using silencing cotton in a silencing cavity comprises a tire body, wherein the tire body comprises a tread part, a sidewall part and a bead part, a self-repairing rubber coating is arranged on the inner wall of the tread along the circumferential direction of a section, and strip-shaped silencing cotton is arranged in the center of the coating; the tire self-repairing sealant is characterized in that the self-repairing rubber coating adopts the tire self-repairing sealant as claimed in claim 1 or 2.
6. The self-repairing tire according to claim 5, wherein the width of the self-repairing rubber coating is set to be 50% -130% of the width of the tread, and the thickness is 0.5-5.0 mm, preferably 2.0-3.0 mm; the width of the self-repairing sizing material coating is set to be 100-200% of the width of the contact surface of the self-repairing sizing material coating and the mute cotton; the soaking depth of the self-repairing sizing material coating soaked in the strip-shaped mute cotton (4) is set to be 0.5-3 mm, and preferably 0.5-1.5 mm.
7. A self-repairing tyre according to claim 5 or 6, characterized in that the belt-shaped silencing cotton (4) is provided with more than one continuous annular hole (6) along the circumferential direction, the belt-shaped silencing cotton (4) is connected end to end, and the annular holes (6) are also connected end to form an annular main silencing cavity which is not communicated with the inner cavity of the tyre; the strip-shaped mute cotton (4) is a spongy porous material prepared by foaming a high polymer material, and the apparent density is 5kg/m3-10kg/m3The strip-shaped silencing cotton (4) is provided with a large number of porous silencing cavities; the side wall of the annular hole (6) is communicated with the plurality of holes of the strip-shaped silencing cotton (4), so that the annular main silencing cavity is communicated with the plurality of porous silencing cavities.
8. A tire noise reduction system according to claim 7, wherein a line connecting the center of gravity of the annular hole (6) and the center of the tread of the tire is perpendicular to a center auxiliary line on which the section width of the tire is located; the annular hole (6) occupies 10-40% of the area of the right section of the strip-shaped mute cotton (4); the radial height of the tire between the tire bead base line and the equator point of the tire cavity is defined as the height Hc of the tire cavity and the thickness Hs of the belt-shaped silencing cotton (4), and the height Hs is more than 20mm and less than 0.2 multiplied by Hc; the radius Rs of a circumscribed circle of the right section of the annular hole (6) is the circle center, and the condition that Rs is more than 4.5mm and less than 0.5Hs-1mm is required.
9. The method of manufacturing a self-healing tire according to any one of claims 7 to 8, comprising the steps of:
step 1, cleaning the inner surface of the vulcanized tire by using high-energy laser, mechanical scraping or chemical reagents, preferably cleaning by using high-energy laser, and ensuring the combination effect of the silencing cotton with the silencing cavity and the inner-layer rubber material;
step 2, using self-repairing coating equipment to carry out a coating process, and circumferentially coating the prepared self-repairing inner layer rubber material on the inner surface of the tread, wherein the coating center line is superposed with the tire center line and the coating width is 90-120% of the width of the widest belt;
step 3, performing coating appearance inspection, and attaching the mute cotton using the silencing cavity on the surface of the self-repairing rubber material by using mute cotton full-automatic attaching equipment after the tire is parked for more than 30 minutes;
and 4, detecting the dynamic balance uniformity of the tire.
10. The manufacturing method according to claim 9, wherein the laser cleaning power in step 3) is 200 to 500kW, preferably 300 to 400 kW.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210060799.8A CN114456744A (en) | 2022-01-19 | 2022-01-19 | Tire self-repairing sealant adhered with mute cotton, tire and tire manufacturing method |
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| CN202210060799.8A CN114456744A (en) | 2022-01-19 | 2022-01-19 | Tire self-repairing sealant adhered with mute cotton, tire and tire manufacturing method |
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