JP2006116912A - Repairing method of punctured tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a repairing method of a punctured tire for certainly returning a tire lowered in its internal pressure upon the reception of an external damage to a runnable state in a short time. <P>SOLUTION: When the internal pressure of the tire mounted on a vehicle through a rim is lowered to atmospheric pressure upon the reception of a damage, high pressure air and a large number of hollow particles, which are composed of a continuous phase due to a thermally expansible resin and closed cells are supplied to the tire air chamber, which is demarcated by the tire and rim mounted on a vehicle, from a pressure-resistant container wherein a large number of hollow particles are housed in high pressure air of which the pressure is not lower than use internal pressure to close the damage part by the hollow particles and the use internal pressure is imparted to the tire by the hollow particles and high pressure air. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a repair method for returning a tire that has been punctured due to trauma to a state in which it can run.

  In pneumatic tires, for example, passenger car tires, air is contained in the tire chamber under a pressure of about 150 kPa to 250 kPa as a gauge pressure, and tension is generated in the tire skeleton such as the carcass and belt of the tire. Therefore, the tire can be deformed and restored in response to the input to the tire. That is, by maintaining the internal pressure of the tire chamber within a predetermined range, a constant tension is generated in the tire skeleton to provide a load support function and increase the rigidity, driving, braking, turning performance, etc. The basic performance necessary for driving the vehicle is given.

  By the way, when the tire held at the predetermined internal pressure is damaged, high pressure air leaks to the outside through the external damage, and the tire internal pressure is reduced to the atmospheric pressure. Most of the tension that was generated in the process will be lost. As a result, the load support function and the driving, braking, and turning performance obtained by applying a predetermined internal pressure to the tire are also lost. As a result, the vehicle equipped with the tire cannot run.

Since the tire that has fallen into the puncture state needs to be repaired by filling the high-pressure gas after closing the wound that caused the puncture, remove the punctured tire from the vehicle and install the spare tire loaded on the vehicle. In general, puncture tires are transported to a repair site at a later date for repair.
Since dealing with punctures is complicated, it has been studied to repair tires while they are mounted on the vehicle at the time of occurrence of punctures. A typical method is a so-called puncture repair agent.

As described in, for example, Patent Document 1, a technique using this puncture repair agent is generally a combination of an adhesive seal liquid and an electric pump that feeds compressed air. Air and sealing liquid are supplied to the inside of the tire, the wound is closed with the sealing liquid, and air is filled to repair the damaged tire immediately.
International Publication No. 2004/048493 Pamphlet

  However, since the sealing liquid is a highly viscous liquid, it is difficult to reach the wound especially when the wound is above the tire. It takes a long time to reach the wound and close it, part of the air replenished before the seal is completed in the preliminary run, and work to further compensate for the leaked air pressure is required. There are disadvantages such as.

  In view of the above, an object of the present invention is to propose a repair method for reliably returning a tire whose internal pressure has decreased due to trauma to the tire to a running state in a short time.

  As a result of intensive studies to solve the above problems, the inventors can instantly close the wound that caused the puncture by utilizing hollow particles composed of a continuous phase and closed cells made of resin. As a result, the present invention has been completed.

That is, the gist configuration of the present invention is as follows.
(1) [Claim 1] When a tire attached to a vehicle via a rim is damaged and the internal pressure is reduced to atmospheric pressure, a thermal expansion is caused in a tire chamber defined by the vehicle-mounted tire and the rim. High pressure gas and hollow particles are supplied from a pressure vessel containing a large number of hollow particles consisting of a continuous phase and closed cells made of a resin capable of being used in a high pressure gas higher than the internal pressure of the tire, and the wound is closed with the hollow particles. A method for repairing a puncture tire, characterized in that an internal pressure is applied by hollow particles and high-pressure gas.

(2) The puncture tire repair method according to (1) above, wherein a filling rate of the hollow particles according to the following formula (I) is 5 vol% or more and 100 vol% or less.
Filling ratio of hollow particles = (particle volume value / tire chamber volume value) × 100 --- (I)
here,
Particle volume value: The total volume of all the hollow particles placed in the tire chamber under the atmospheric pressure and the total void volume around the particles (cm ³ )
Tire chamber volume value: After filling the tire and rim assembly with air only and adjusting to the internal pressure (kPa), the amount of air discharged when the internal air is discharged until the internal pressure reaches atmospheric pressure (cm ³ ) using the following formula (II) (cm
³ )
Tire chamber volume value = (filled air discharge) / (internal pressure / atmospheric pressure) --- (II)
In the formula (II), the gauge pressure (kPa) is used for the internal pressure, and the absolute value (kPa) using a barometer is used for the atmospheric pressure value.

(3) The method for repairing a puncture tire according to (2) above, wherein a filling rate of the hollow particles is 10 vol% or more.

(4) In the above (1) to (3), inflatable resin particles in which a gas component is encapsulated in a resin as a foaming agent in a liquid state are mixed with the hollow particles and filled into a tire chamber. The repair method of the puncture tire in any one.

(5) The method for repairing a puncture tire according to any one of (1) to (4), wherein the hollow particles have a thermal expansion start temperature Ts2 of 40 to 200 ° C.

(6) The method for repairing a puncture tire according to any one of (1) to (5) above, wherein a thermal expansion start temperature Ts2 of the hollow particles is 40 to 150 ° C.

(7) The method for repairing a puncture tire according to any one of (1) to (6) above, wherein a thermal expansion start temperature Ts2 of the hollow particles is 40 to 120 ° C.

(8) The method for repairing a puncture tire according to any one of (1) to (7), wherein the thermal expansion start temperature Ts2 of the hollow particles is 40 to 100 ° C.

(9) The method for repairing a puncture tire according to any one of (1) to (8) above, wherein the hollow particles are used by adjusting the pressure in the hollow portion to 70% or more of the use internal pressure of the tire.

(10) The method for repairing a puncture tire according to any one of (1) to (9) above, wherein the hollow particles are used by adjusting the pressure in the hollow portion to 80% or more of the use internal pressure of the tire.

(11) The method for repairing a puncture tire according to any one of (1) to (10) above, wherein the hollow particles are used by adjusting the pressure in the hollow portion to 90% or more of the use internal pressure of the tire.

(12) The method for repairing a puncture tire according to any one of (1) to (11) above, wherein the hollow particles are used by adjusting the pressure in the hollow portion to 100% or more of the use internal pressure of the tire.

(13) The average particle diameter of the hollow particle group filled in the tire chamber is in the range of 40 to 200 μm, and the average true specific gravity of the hollow particle group is in the range of 0.01 to 0.06 g / cm ^3. The puncture tire repair method according to any one of (1) to (12) above.

(14) The gas in the hollow part of the hollow particles is nitrogen, air, linear and branched aliphatic hydrocarbons having 2 to 8 carbon atoms and fluorinated products thereof, alicyclic hydrocarbons having 2 to 8 carbon atoms, and The fluorinated product and the following general formula (III):
R ¹ —O—R ² ---- (III)
(Wherein R ¹ and R ² are each independently a monovalent hydrocarbon group having 1 to 5 carbon atoms, and part of the hydrogen atoms of the hydrocarbon group may be replaced by fluorine atoms) The puncture tire repair method according to any one of (1) to (13) above, wherein the repair method is at least one selected from the group consisting of ether compounds represented by:

(15) The above-mentioned (1) to (1), wherein the resin that is a continuous phase of the hollow particles comprises at least one of a polyvinyl alcohol resin, an acrylonitrile polymer, an acrylic polymer, and a vinylidene chloride polymer. (14) The puncture tire repair method described in any one of (14).

(16) The continuous phase of the hollow particles is composed of an acrylonitrile polymer, and the acrylonitrile polymer is an acrylonitrile polymer, an acrylonitrile / methacrylonitrile copolymer, an acrylonitrile / methyl methacrylate copolymer, or an acrylonitrile / methacrylonitrile / methyl methacrylate. The repair of a puncture tire according to any one of (1) to (15) above, which is at least one selected from a terpolymer and an acrylonitrile / methacrylonitrile / methacrylic acid terpolymer Method.

(17) A large number of foams whose average bulk specific gravity under atmospheric pressure is larger than the average true specific gravity of the hollow particles are arranged in the tire chamber, and are mixed with the hollow particle group for closing the wound. The puncture tire repair method according to any one of (1) to (16) above.

(18) The foam has a substantially spherical shape with a diameter of 1 to 15 mm or a cubic shape with a side of 1 to 15 mm, an average bulk specific gravity of 0.06 to 0.3 (g / cc), and a closed cell. Or it has a communication bubble, The repair method of the puncture tire as described in said (17) characterized by the above-mentioned.

  Here, the pressure of the tire chamber described in the text indicates a gauge pressure (pressure indicated on the gauge) unless otherwise specified.

  According to the present invention, the wound that caused the puncture is instantly closed by the filled hollow particles, so that the tire whose internal pressure is reduced due to the trauma to the tire can be reliably and quickly brought into a runnable state. Can be restored.

  Further, since the hollow particles are accommodated in a high pressure environment that is equal to or higher than the tire use internal pressure in the pressure vessel, and the pressure of the hollow portion is 70% or more of the tire use internal pressure, the pressure vessel is put into the tire. When supplied, it can also contribute to an increase in the internal pressure of the tire, and a certain distance can be quickly achieved.

  Further, of the filled hollow particles, the hollow particles other than those used for closing the wound remain in the tire chamber, and this remaining hollow particle functions to close the wound when re-injured and to restore the reduced internal pressure. Therefore, the tire that has undergone the repair according to the present invention is a safety tire that does not fall into a runnable state even after being damaged again.

Below, the repair method of the puncture tire of this invention is demonstrated in detail with reference to FIG.
That is, when puncture occurs in the tire 2 attached to the vehicle via the rim 1, a large number of hollow particles composed of a continuous phase and closed cells are formed in the tire chamber defined by the tire 2 and the rim 1. The hollow particles and the high-pressure gas are supplied from a pressure-resistant container in which the gas is contained in a high-pressure gas that is equal to or higher than the use internal pressure of the tire.
Specifically, as shown in FIG. 1, for example, a PET bottle 3 is used as a pressure resistant container. Inside the PET bottle 3, as shown in FIG. 2, hollow particles 4 and a gas 5 such as air or nitrogen are contained under a pressure equal to or higher than the use internal pressure of the tire 2.

  Furthermore, as shown in FIG. 2, the opening 6 of the PET bottle 3 has a sealing structure by melt adhesion of the film 6a, and the penetration into the inside of the bottle 3 is not possible until the film 6a is fitted to the valve 1a of the tire. It is supposed to be. Specifically, a safety cap 6b is further attached to the opening 6 sealed with the film 6a, and the safety cap 6b is screwed to press the blade 6c inside the cap against the film 6a to tear the film. ing. As a result, communication between the bottle 3 and the tire chamber is achieved via the connecting hose 6d.

  The method for sealing the opening of the container is not limited in any way, and any structure may be used as long as it can be maintained under high pressure for a long period of time, and the hollow particles and the high-pressure gas can be transferred into the tire chamber without leakage at the time of opening.

  That is, as shown in FIG. 1, when the PET bottle 3 is fitted to the tire valve 1a, the seal structure is opened and the inside of the bottle 3 communicates with the air chamber of the tire, resulting in hollow particles on the tire side. 4 and high-pressure gas 5 will flow in. This continues until the pressure difference between the inside of the bottle 3 and the air chamber of the tire 2 is eliminated.

  Thus, the hollow particles 4 filled in the air chamber of the tire 2 have closed cells surrounded by a continuous phase of a substantially spherical resin, and have an average particle size distribution in the range of about 20 μm to 500 μm. A hollow structure or a spongy structure including a large number of small cells formed by closed cells. That is, the hollow particle 4 is a particle that encloses closed closed cells that do not communicate with the outside, and the number of closed cells may be singular or plural. Here, “inside the closed cells of the hollow particle group” is generically expressed as “hollow part”. The hollow particles having closed cells indicate that the particles have a “resin shell” for enclosing the closed cells in a sealed state. Furthermore, the continuous phase by the above-mentioned resin refers to this “continuous phase on the component composition constituting the resin shell”. The composition of the resin shell is as described later.

When the hollow particle group in which a large number of the hollow particles 4 are gathered is filled inside the tire chamber together with, for example, a high-pressure gas, the simultaneously supplied gas leaks out of the tire through the wound from the tire chamber. Riding in the air currents floods the wound and closes it.
That is, the wound becomes a flow path through which the gas in the tire chamber leaks, but the flow path length substantially corresponds to the thickness of the tire. The hollow particles of the present invention can enter the “consolidation” state in the flow path and clog the flow path with a large number of hollow particles. Further, when the pressure in the tire chamber is increased from the atmospheric pressure, tension is applied to the tire frame, so that the inner diameter of the wound is reduced so as to be narrowed down. Therefore, a compressive force acts on the hollow particle group that has entered the wound in a compacted state so as to be squeezed from the tire side by the pressure increase in the tire chamber. Here, since the hollow part pressure of the present invention is high in the hollow part pressure, a reaction force due to the hollow part pressure is generated with respect to this compressive force, so that the degree of consolidation can be increased, and a larger inner diameter can be obtained. Even at the wound, the wound can be closed to such an extent that the gas in the tire chamber hardly leaks out.
Therefore, the wound that caused the puncture can be instantly and reliably closed with the hollow particles.

  If the wound is thus closed, the internal pressure can be increased by the high-pressure gas, and it is preferable to fill the gas until the “use internal pressure” of the tire is reached. Therefore, it is preferable that the bottle 3 contains a gas having a volume sufficient to fill the tire chamber under the use internal pressure. In addition, as long as the internal pressure restoration | recovery function by the hollow particle mentioned later can be used together, the gas volume in the bottle 3 may be less than the quantity which fills an air chamber. Here, “internal pressure” refers to “a tire chamber pressure value (gauge pressure value) for each mounting position specified by an automobile manufacturer for each vehicle”.

Moreover, when filling the above-described hollow particles 4 into the tire chamber, the filling rate of the hollow particles according to the following formula (I) is preferably set to 5 vol% or more and 100 vol% or less.
Filling ratio of hollow particles = (particle volume value / tire chamber volume value) × 100 --- (I)
Here, the particle volume value is the total amount (cm ³ ) of the total volume of all the hollow particles arranged in the tire chamber under atmospheric pressure and the void volume around the particles.

The tire chamber volume value is adjusted to the working internal pressure (kPa) by filling the tire and rim assembly with only air, and then the filled air is discharged when the filled air is discharged to the atmospheric pressure. It is a value (cm ³ ) obtained from the following formula (II) using the amount (cm ³ ).
Tire chamber volume value = (filled air discharge) / (internal pressure / atmospheric pressure) --- (II)
In equation (II), the gauge pressure value (kPa) is used for the internal pressure, and the absolute value (kPa) measured by a barometer is used for the atmospheric pressure value. That is, the atmospheric pressure is represented by 0 [kPa] as a gauge pressure, but since the atmospheric pressure value itself fluctuates every day, the absolute value observed from the barometer at that time is used. Therefore, for example, when the atmospheric pressure at a certain time is 1013 hPa, 101.3 kPa is used as the absolute value of atmospheric pressure in the formula (II).

The reason why the calculated filling rate of the hollow particles is 5 vol% or more is that if it is less than 5 vol%, the wounded part can be closed without any problem, but the absolute amount of the hollow particles is insufficient. It becomes difficult to obtain a sufficient reviving internal pressure up to a pressure level at which the side portion does not contact the ground. If the running is continued without sufficient reviving internal pressure being obtained, the side portions are worn by the road surface and are damaged at an early stage, which is not preferable.
On the other hand, if it is 100 vol% or less, it is possible to fill the tire chamber by the method of the present invention, but if it exceeds 100 vol%, filling itself is difficult and it is necessary to compress the hollow particles at a higher pressure. It becomes. For that purpose, equipment such as an electric compressor is necessary and complicated.

  The following method is suitable for filling the hollow particles into the tire chamber at a predetermined filling rate. That is, after clarifying the target tire internal volume, from a transparent container containing hollow particles of known volume, filling the tire chamber with hollow particles, and from the hollow particle volume remaining in the container after filling A method for confirming the amount of hollow particles filled in the tire chamber is suitable.

  By the way, the volume of the tire differs depending on the size and the combination with the rim. Further, when the internal pressure is reduced due to puncture, the internal pressure value at which the side portion contacts the road surface also varies depending on the tire. In the present invention, there is an aim to utilize the tire as a pressure vessel even after puncture damage, and in the low internal pressure traveling below the internal pressure value where the side portion contacts the road surface, the tire that is the pressure vessel will break down, The following prerequisites are essential:

That is, with respect to the known inner volume of the tire / rim assembly, the hollow particle volume necessary for obtaining the reviving internal pressure to an internal pressure value or higher at which the side portion does not come into contact with the road surface is obtained in advance. Filling with hollow particles.
In the present invention, it is important to quickly and surely fill the tire with a high volume of hollow particles and a high-pressure gas by a simple operation. If the hollow particles of a predetermined volume or more are filled, the container is hollow. Even if the particles remain, the effects of the present invention can be sufficiently exerted.

Further, when the pressure in the bottle 3 and the air chamber of the tire 2 are balanced, the flow of gas and hollow particles from the bottle 3 into the air chamber is stopped. 4, and if the filled hollow particle volume is less than the specified volume, as shown in FIG. 3, as shown in FIG. A method of filling the hollow particles into the tire chamber is effective. The valve 3 a is preferably provided with a filter 30 for preventing the hollow particles 4 from leaking out of the bottle 3 and having a valve core that leaks excess gas out of the bottle 3.
Alternatively, as shown in FIG. 4, it is also effective to operate the branch valve 20 arranged in advance to once release the pressure in the tire from the flow path 20a with the filter 30 and to set the inside of the tire to atmospheric pressure.
Furthermore, as shown in FIG. 5, an opening 3b with a filter 30 is provided on the bottom side of the bottle 3 (or the valve with filter 3a shown in FIG. 3 is acceptable), and the opening 3b is closed with a seal 3c. When the pressure in the inside of the bottle 3 and the air chamber of the tire 2 is balanced, the seal 3c is peeled off to open the opening 3b (or valve 3a). The remaining hollow particles can be transferred into the tire by changing the volume of the bottle while deforming so as to crush.

  By the way, since the hollow particles filled in the tire chamber are contained in the pressure vessel for a certain period under a high pressure equal to or higher than the use internal pressure, the pressure in the hollow portion is equal to or higher than the use internal pressure as in the surroundings. The hollow particles stored in this manner are maintained at the internal pressure of the hollow portion at the stage of supply to the tire air chamber at atmospheric pressure. It will contribute to the rise, and the internal pressure will be raised in cooperation with the high-pressure gas. Therefore, as a result of increasing the internal pressure simultaneously with the closure of the wound by the hollow particles, the restoration of the puncture tire is completed instantly. The mechanism for releasing the internal pressure of the hollow part will be described in detail below.

First, the significance of housing hollow particles and high-pressure gas in a pressure vessel will be described.
That is, the hollow particles 4 are accommodated together with the high-pressure gas in the pressure-resistant container (PET bottle) 3, but initially, the pressure inside the hollow part of the hollow particles (the pressure in the closed cells) ) Is approximately equal to atmospheric pressure and less than the pressure in the vessel, the particles are reduced in volume. The shape of the hollow particles at this point is not a substantially spherical shape, but is a flattened shape distorted from a spherical shape. When the tire is filled with hollow particles that are flattened and distorted, the pressure in the hollow portion (pressure in the closed cell) is almost equal to atmospheric pressure. As a result, the blocking capability remains at a low level compared to the blocking mechanism. In other words, the size of the wound that can be closed is limited to a small size. Further, even if the hollow particles are not ejected to the outside of the tire, the hollow particles are flattened and distorted, and thus there are many micro passages, and thus gas in the tire chamber may leak. Further, the hollow particles are more likely to be broken by the subsequent running due to collision between the particles and collision with the inner surface of the tire and the rim as compared with the spherical shape. That is, when the hollow particles are flattened and distorted, the input due to the collision cannot be uniformly dispersed, resulting in a great disadvantage in terms of durability. Therefore, when it is damaged again, there is a possibility that the hollow particles cannot block the damaged part and restore the internal pressure.

  On the other hand, flattened and distorted hollow particles are in a state of volume reduction due to the difference between the pressure in the hollow part and the pressure in the container, but by maintaining the pressure in the pressure resistant container for a certain period of time, the hollow particles The pressure in the hollow portion, that is, the pressure in the closed cell in the particle can be increased to the pressure of the pressure vessel. That is, since the flattened hollow particles are deformed, a force for returning to the original substantially spherical shape acts on the shell portion. In addition, since the pressure in the hollow part of the flattened hollow particles is lower than the pressure vessel pressure, gas molecules in the pressure vessel pass through the continuous phase shell made of resin in order to eliminate the pressure difference. Penetrate into the hollow part of the particles. Furthermore, since the hollow part of a hollow particle is a closed cell and the gas in it is satisfy | filled with the gas resulting from a foaming agent, it may differ from the gas in a pressure-resistant container (gap part surrounding particle | grains). In this case, not only the above-described pressure difference but also the gas partial pressure difference, the high-pressure gas in the pressure vessel penetrates into the particle hollow portion until the partial pressure difference is eliminated. Thus, since the high pressure gas in the pressure vessel penetrates into the hollow portion of the hollow particles with time, the pressure in the pressure vessel decreases by the amount permeated into the hollow portion. Therefore, in order to compensate for the amount of the hollow particles that have penetrated into the hollow portion, a pressure-resistant container having the contents adjusted to the desired use internal pressure can be obtained at an early stage by continuously applying the desired pressure after filling the high-pressure gas. Can do.

  Thus, the pressure inside the hollow part of the hollow particle approaches the pressure inside the pressure vessel (the void around the particle) and recovers the particle volume once reduced, and the particle shape is flattened and distorted. It will recover to its original spherical shape. In the process of recovering this shape, the pressure in the hollow part of the hollow particle increases to at least 70% of the pressure in the pressure vessel, so that the particle shape recovers from a flattened state to a substantially spherical shape. This can guarantee the durability of the particles described above.

  Thus, the hollow particles are placed in a pressure vessel separate from the tire, and the void pressure around the particles is maintained at least 70% higher than the desired working pressure in the tire chamber. The above particles are stored in the pressure vessel while being applied for an appropriate period of time, and the particles in the state where the pressure in the hollow portion of the hollow particles is increased are supplied into the tire chamber together with the surrounding atmosphere. In hollow particles whose volume has been recovered, the particle shape recovers to a substantially spherical shape, and as a result, the fatigue and breakage applied to the particles due to repeated deformation during rolling of the tire during running after repair can be greatly reduced. Durability is not impaired. The range in which the durability of the hollow particles is not impaired is that the pressure in the hollow portion of the hollow particles is equal to the desired pressure in the tire chamber in the desired high pressure environment such as the vehicle specified internal pressure to be installed. It is preferably at least 70%. Furthermore, it is recommended to set a high value of 80% or more, 90% or more, and 100% or more.

  The appropriate retention time described above is set in consideration of the permeability of the void gas to the shell portion of the hollow particle, that is, the continuous phase of the particle, and the partial pressure difference between the gas in the particle hollow portion and the void gas. That's fine.

  By selecting and adjusting the type and pressure of the gas filled in the pressure vessel (the void around the particle) in accordance with the mechanism, particle shape, and volume change process described above, the inside of the hollow part of the hollow particle Can be set within a desired range.

  Thus, when the hollow particles adjusted in the pressure vessel are supplied into the tire chamber, the pressure in the hollow portion (the pressure in the bubbles in the closed cells) is maintained at a high pressure in accordance with the above-mentioned use internal pressure. In other words, it exists in the tire chamber while maintaining the particle volume and the hollow portion pressure. Further, since the traveling after the repair is a low internal pressure traveling near the atmospheric pressure, the tire rolls while being largely bent. Therefore, due to the self-heating of the tire itself, the temperature in the tire chamber as well as the tire rises significantly. As described above, since the hollow particles are heated and volume-expanded, the void gas around the particles is compressed, so that the pressure increase in the tire chamber is assisted. The chamber pressure rises rapidly. As a result, the restoration of the puncture tire is completed early.

Furthermore, the tire repaired in accordance with the above, as shown in the tire cross section after repair assembled in the rim in FIG. 5, includes hollow particles 4 that were not used for closing the wound in the tire chamber 2a, Of course, the hollow particles 4 exhibit the above-described function of closing the wound even when the puncture is performed again. However, under a predetermined filling amount, the hollow particle 4 has a function of restoring the internal pressure to cope with a decrease in the internal pressure during puncture. Can also be granted. For that purpose, it is preferable that the filling rate of the hollow particles described above be 5 vol% or more.
In FIG. 5, reference numeral 7 denotes a bead core, 8 denotes a carcass, 9 denotes a belt, 10 denotes a tread, and 11 denotes an inner liner.

Next, the behavior of the hollow particles when the repaired tire is filled with the above-mentioned hollow particle filling rate of 5 vol% or more and is damaged after use after repair will be described.
Now, in the tire and rim assembly in which the above-described hollow particle group is arranged in the tire chamber, when the tire is damaged again, the high-pressure gas in the tire chamber existing in the gap between the hollow particles 4 is removed. As a result of leaking to the outside of the tire, the pressure in the tire chamber drops to a pressure comparable to atmospheric pressure. In the course of the tire chamber pressure drop, the following occurs in the tire chamber.

  First, when the tire is damaged and the pressure in the tire chamber begins to decrease, a large number of hollow particles block the damaged portion and suppress a rapid decrease in the air chamber pressure. On the other hand, as the air chamber pressure decreases, the amount of tire deflection increases and the tire air chamber volume decreases. Further, when the air chamber pressure is lowered, the tire is greatly bent, and the hollow particles arranged in the tire air chamber are subjected to compression and shear inputs while being sandwiched between the tire inner surface and the rim inner surface.

  On the other hand, the pressure in the hollow portion of the hollow particles that existed under the above-mentioned use internal pressure (bubble internal pressure in closed cells) remains high after the damage, in other words, the pressure inside the hollow cell is injured. It exists in the tire chamber while maintaining the previous particle volume and hollow part pressure. Therefore, when the tire further rolls, the hollow particles themselves bear a load while the hollow particles cause friction and self-heat, so that the temperature of the hollow particles in the tire chamber rises rapidly. When the temperature exceeds the thermal expansion start temperature of the hollow particles (Ts2: corresponding to the glass transition temperature of the resin), the shell of the particles starts to soften. At this time, since the pressure in the hollow part of the hollow particle is a high pressure corresponding to the working internal pressure, and the hollow part pressure is further increased due to a sudden rise in the temperature of the hollow particle, the hollow particle expands at a stretch and the particle Since the surrounding void gas is compressed, the pressure of the tire chamber can be recovered to at least the tire chamber pressure at which the side portion of the tire does not come into contact with the ground.

If the pressure in the hollow part of the hollow particles is set to a high pressure equal to or higher than the atmospheric pressure by the above mechanism, the function of restoring the internal pressure can be exhibited.
That is, in order to restore the pressure in the tire chamber to the tire internal pressure at which the side portion does not come into contact with the ground, hollow particles whose pressure in the hollow portion is at least 70% of the used internal pressure are reduced with a filling rate of 5 vol% or more. As described above, it is important to dispose the tire in the tire chamber.

  Further, in order to surely develop the above-described internal pressure restoration function, it is important to reliably close the wounded part before the internal pressure restoration function is manifested. That is, if the wounded part is not completely closed, the pressure that should have been restored leaks from the wounded part, so that the pressure obtained by the internal pressure restoration function can only contribute temporarily to the subsequent driving ability. This is because there is a risk that the running performance after being injured cannot be guaranteed. Since the hollow particles are particles having a low specific gravity and elasticity due to the hollow structure, when the tire is damaged and the void gas around the hollow particles starts to leak from the damaged portion, the hollow particles get on the flow due to the leakage of the void gas. Immediately close to the injured part, the wound of the injured part is immediately closed. As described above, the function of closing the damaged part by the hollow particles is an essential function that supports the function of restoring the internal pressure of the present invention.

  As described above, in the repaired tire and rim assembly filled with hollow particles, in addition to the tire heat generation accompanying the decrease in the tire chamber volume and the increase in the deflection of the tire due to the decrease in the internal pressure after the puncture, By causing friction between the hollow particles, the internal temperature can be restored due to the expansion of the particles along with the rapid temperature rise of the particles.

  In addition, the inventors diligently studied the actual state of heat generation and expansion of the hollow particles, and found an appropriate range of the hollow particles. Now, the hollow particles are obtained by heating and expanding the “expandable resin particles” as the raw material, and the expandable resin particles have an expansion start temperature Ts1. Furthermore, when the hollow particles obtained by heating expansion are heated again from room temperature, the hollow particles start to expand further, and there exists a reexpansion start temperature Ts2 of the hollow particles. As a result of producing hollow particles from many expandable resin particles and studying them, the inventors have used Ts1 as an index of expansion characteristics. However, Ts2 is appropriate as an index of expansion characteristics of hollow particles. I came to find out.

First, the expansion behavior was observed when the expandable resin particles were heated and expanded. Since the expandable resin particles are in a stage before expansion, the particle diameter is extremely small as compared with the state of the hollow particles, and the thickness of the resin shell is extremely thick. Therefore, the microcapsule has a high rigidity. Therefore, even if the continuous phase of the resin shell exceeds the glass transition point in the process of thermal expansion, the expansion force of the internal gas overcomes the rigidity of the shell until the shell is softened to some extent by further heating. I can't. Therefore, Ts1 shows a higher value than the actual glass point transfer of the shell.
On the other hand, when the hollow particles are heated and expanded again, the thickness of the shell of the hollow particles is extremely thin and the rigidity as the hollow body is low. Therefore, since the continuous phase of the shell exceeds the glass transition point in the process of thermal expansion, expansion starts at the same time, so Ts2 is positioned lower than Ts1.

In the present invention, there is a case where the further expansion characteristics of the hollow particles once expanded are utilized, and in addition to the above, the expansion characteristics of the expandable resin particles may be further utilized. In order to achieve this, it is important to use the conventional Ts1 and Ts2 in accordance with each case.
That is, it is important that Ts2 of the hollow particles and Ts1 of the expandable resin particles are 40 ° C. or higher and 200 ° C. or lower. This is because if Ts2 of the hollow particles and Ts1 of the expandable resin particles are less than 40 ° C., in view of the storage temperature of the pressure resistant container in the vehicle, there is a possibility of expansion in a storage environment.
On the other hand, if the temperature exceeds 200 ° C., Ts2 and Ts1 may not be reached even if a sudden temperature rise due to frictional heat generation of the hollow particles occurs in the run flat running after puncture damage. In some cases, the “internal pressure restoration function” cannot be fully developed.

  Therefore, the range of Ts2 and Ts1 is 40 ° C. or more and 200 ° C. or less, preferably 150 ° C. or less, more preferably 120 ° C. or less, and most preferably 100 ° C. or less.

  As described above, hollow particles having a reexpansion start temperature Ts2 according to the above upper limit value and lower limit value, or expandable resin particles having a reexpansion start temperature Ts1 according to the above upper limit value and lower limit value are further added to the hollow particles. By arranging these, the internal pressure restoration function is surely expressed, while “internal pressure restoration function maintenance” is achieved in regular storage.

  In order to reinforce the function of restoring the internal pressure, the mixing ratio of the expandable resin particles when the expandable resin particles are mixed in the hollow particles and filled into the tire chamber is 5 vol% to 100 vol% of the hollow particle volume. It is a range. That is, if it is less than 5 vol%, the effect of adding expandable resin particles cannot be clearly obtained. On the other hand, if it exceeds 100 vol%, the endothermic amount of the expandable resin particles increases, and the pressure increase rate when the internal pressure is restored may become slow. As a result, there is a concern that the tire itself, which is a pressure vessel, may break down due to the length of time that the side portion is in contact with the road surface.

Next, as the gas constituting the hollow part (closed cell) of the hollow particle, nitrogen, air, linear and branched aliphatic hydrocarbons having 2 to 8 carbon atoms and fluorinated products thereof, carbon numbers 2 to 8 are used. And fluorinated products thereof, and the following general formula (III):
R ¹ —O—R ² ---- (III)
(Wherein R ¹ and R ² are each independently a monovalent hydrocarbon group having 1 to 5 carbon atoms, and part of the hydrogen atoms of the hydrocarbon group may be replaced by fluorine atoms) And at least one selected from the group consisting of ether compounds. The gas filled into the tire chamber may be air. However, when the gas in the particles is not a fluorinated product, a gas not containing oxygen, such as nitrogen or an inert gas, is preferable from the viewpoint of safety.

  The method for obtaining hollow particles having closed cells is not particularly limited, but a general method is to produce “expandable resin particles” using a foaming agent and to heat and expand them. Examples of the foaming agent include a method utilizing vapor pressure such as high-pressure compressed gas and liquefied gas, and a method utilizing a thermally decomposable foaming agent that generates gas by thermal decomposition.

  Many of the latter thermally decomposable foaming agents are characterized by generating nitrogen, and the particles obtained by appropriately controlling the reaction of the expandable resin particles obtained by foaming by these have mainly nitrogen in the bubbles. It will be a thing. Although it does not specifically limit as this thermally decomposable foaming agent, Dinitroso pentamethylenetetramine, azodicarbonamide, para-toluene sulfonyl hydrazine and its derivative (s), and oxybisbenzene sulfonyl hydrazine can be mentioned suitably.

Next, a technique for obtaining “expandable resin particles” that become hollow particles by utilizing the vapor pressure of the former high-pressure compressed gas and liquefied gas will be described.
When polymerizing the continuous phase of the resin forming the hollow particles, linear and branched aliphatic hydrocarbons having 2 to 8 carbon atoms and fluorinated products thereof, alicyclic hydrocarbons having 2 to 8 carbon atoms and Fluorides and the following general formula (III):
R ¹ —O—R ² ---- (III)
(Wherein R ¹ and R ² are each independently a monovalent hydrocarbon group having 1 to 5 carbon atoms, and part of the hydrogen atoms of the hydrocarbon group may be replaced by fluorine atoms) In this method, at least one selected from the group consisting of ether compounds represented by the following formula is liquefied under high pressure as a blowing agent and dispersed in a reaction solvent, followed by emulsion polymerization. As a result, it is possible to obtain “expandable resin particles” in which the gas components shown above are contained in a liquid state foaming agent in the resin continuous phase of the previous operation, and by heating and expanding this, desired hollow particles are obtained. I can get it.

  Further, the surface of the “expandable resin particles” is coated with an anti-blocking agent such as silica particles, carbon black fine powder, antistatic agent, surfactant, oil agent, etc. Can be obtained.

  Further, in the state where the pressure of the tire chamber is reduced due to damage, in order to apply the minimum necessary internal pressure by the hollow particles, the gas sealed at the predetermined pressure in the hollow portion of the hollow particles does not leak out of the particles. In other words, it is important that the continuous phase of the resin corresponding to the shell part of the hollow particles has a property that gas is difficult to permeate. That is, the resin constituting the continuous phase is made of a material having low gas permeability, specifically, it is made of at least one of acrylonitrile copolymer, acrylic copolymer, and vinylidene chloride copolymer. Is essential. These materials are particularly effective in the present invention because they have flexibility as hollow particles with respect to input due to tire deformation.

  In particular, it is preferable to apply any one of an acrylonitrile polymer, an acrylic polymer, and a vinylidene chloride polymer to the continuous phase of the hollow particles. More specifically, the polymer constituting the polymer is a polymer selected from acrylonitrile, methacrylonitrile, methyl methacrylate, methacrylic acid, and vinylidene chloride, preferably acrylonitrile / methacrylonitrile / methyl methacrylate terpolymer, acrylonitrile. At least one selected from the group consisting of / methacrylonitrile / methacrylic acid terpolymer is advantageously suitable. Since all of these materials have a small gas permeability coefficient and are difficult for gas to permeate, the gas in the hollow part of the hollow particles hardly leaks to the outside, and the pressure in the hollow part can be appropriately maintained.

Further, the continuous phase of the hollow particles has a gas permeability coefficient at 30 ° C. of 300 × 10 ⁻¹² (cc · cm / cm ² · s · cmHg) or less, preferably a gas permeability coefficient at 30 ° C. of 20 × 10 ⁻¹² ( ^{cc · cm / cm 2 · s} · cmHg) or less, it is recommended and further preferably the gas permeability coefficient at 30 ° C. is ^{2 × 10 -12 (cc · cm} / cm 2 · s · cmHg) or less. This is because the gas permeability coefficient of the inner liner layer in a normal pneumatic tire is at a level of 300 × 10 ⁻¹² (cc · cm / cm ² · s · cmHg) or less and has a sufficient internal pressure holding function. In view of the above, the gas permeation coefficient at 30 ° C. was set to 300 × 10 ⁻¹² (cc · cm / cm ² · s · cmHg) or less for the continuous phase of the particles. However, at this gas permeation coefficient level, it is necessary to replenish the internal pressure once every 3 to 6 months. From the standpoint of maintainability, 20 × 10 ⁻¹² (cc · cm / cm ² · s · cmHg) or less, more preferably 2 × 10 ⁻¹² (cc · cm / cm ² · s · cmHg) or less is recommended.

  Here, when filling the tire air chamber with the hollow particles according to the present invention, the average bulk specific gravity under atmospheric pressure is increased in the tire air chamber in order to enhance the function of closing the tire damage portion when the tire is damaged. It is effective to arrange a large number of foams larger than the average true specific gravity of the particles and to mix them with the hollow particle group for closing the wound. That is, it is effective to arrange a large number of foams in the tire chamber in advance, or to fill the hollow particles separately or together after puncturing. Specifically, it has a substantially spherical shape with a diameter of 1 to 15 mm or a cubic shape with a side of 1 to 15 mm, has independent or open cells, has an average bulk specific gravity of 0.06 to 0.3 g / cc, and particles By adding a large number of foams having a bulk specific gravity value larger than the average true specific gravity, it is possible to extend the expression period of the internal pressure restoration function and increase the running ability after tire damage.

  That is, since the hollow particles have a substantially spherical shape, the fluidity is high, so that the hollow particles can be easily arranged from the inlet having a small inner diameter such as a tire valve into the tire chamber. On the other hand, when the tire is damaged, the hollow particles gather from the damaged portion inside the damaged portion in an attempt to blow out with the high-pressure gas in the tire chamber from the damaged portion to the outside of the tire. However, since the wound path from the inner surface of the scratched part to the outer peripheral surface of the tire is not a straight line but presents a complicated and complicated shape, the particles entering from the wound on the inner surface of the tire are obstructed on the way of the path, resulting in a large number of hollow particles. Will gather in a compressed state on the inner surface of the damaged part, and the damaged part is temporarily closed. Here, provisionally clogging refers to a state in which the hollow particles themselves do not leak, but the void gas around the particles gradually leaks.

At that time, if the size of the scratch on the damaged part is extremely large, the temporary blockage by only the particles may be incomplete, and the hollow particles may leak out of the tire. In such a case, by adding a large number of the above-mentioned foams, the level of wound closure can be improved as follows.
First, if a large number of the above-mentioned foams are arranged in the tire chamber in advance, along with the leakage of the gas in the tire chamber due to puncture, the foam adheres to the inner surface of the wound and accompanies the pressure and rotation in the tire chamber. Due to the centrifugal force, it enters a state where it is further submerged inside the wound. When the hollow particles are filled by a subsequent repair, the wound in which the foam has entered is closed, and an extremely reliable closed state can be obtained.

  On the other hand, in the tire after repair, a centrifugal force corresponding to the speed is generated in the tire chamber during rolling, and the foam having a large bulk specific gravity under the centrifugal force is directed to the inner liner side of the tire. The hollow particles having a small true specific gravity are unevenly distributed closer to the rotation center than the foam. In this state, even if a scratch of a size that cannot be closed only by the particles is received again, the foam is unevenly distributed near the inner liner surface of the tire inner surface. It is very effective because the wounded part is closed by promptly coming into close contact with the inner surface of the wounded part of the wounded part in order to blow out to the outside.

  In particular, when the foam is a foam having open cells, it has high compressibility, easily adheres to the shape of the wound, and easily enters into the inside of the wound, and as a result, a large wound is extremely complicated and fine by the foam. This makes it possible to change the complicated and refined gas dissipating flow path to a state most suitable for closing with the hollow particles, which is a very effective means.

Moreover, it is preferable to have a tire valve used in combination with hollow particles and gas filling. The tire valve includes a filter that blocks hollow particles in the tire chamber and allows only gas to pass outside the tire chamber. By attaching such a tire valve, when manufacturing the tire and rim assembly of the present invention, it is possible to place hollow particles in the tire chamber with only one valve. A general-purpose rim having only holes can be used as it is. In addition, it is possible to prevent “leakage of hollow particles in the gas replenishing operation” against the natural drop of the tire chamber pressure during normal running, and to easily maintain the tire chamber pressure.
As such a tire valve, one having the structure illustrated in FIG. 6 can be used. Here, the code | symbol 12 is the said filter, For example, a nonwoven fabric can be used.

  The hollow particles shown in Table 1 were prepared as fillers for repairing puncture tires, and each was accommodated in a pressure vessel (made of polyethylene terephthalate resin) shown in FIG. 2 according to the conditions shown in Table 1 and shown in Table 1. The puncture tire was repaired by storing it under pressure for a certain period and supplying hollow particles and high-pressure gas from the pressure vessel. Table 1 shows the results of a survey of wound obstruction and repair ability after re-puncture in each repair.

  In Table 1, the types of compositions constituting the continuous phase of the hollow particles are as shown in Table 2. The expandable resin particles shown in Table 2 were heated and expanded to form hollow particles, and the average particle diameter and average true specific gravity of the obtained particle group were measured. The hollow particles shown in Table 3 were filled in each tire air chamber under the filling rate shown in Table 1. For the tire, an assembly of a 195 / 45ZR16 tire and a 7.0J-16 rim was installed on a passenger car with a displacement of 1500 cc, and a 6mmφ nail was stepped and damaged under an internal pressure of 200kPa. Was used.

Here, in the examples, a predetermined amount of hollow particles and high-pressure gas in the container were filled into the tire chamber, and the tire chamber pressure after filling was determined. Further, the tire internal pressure after traveling 10 km at a speed of 50 km / h was measured. The wound blockage indicates that the higher the tire internal pressure, the better the wound blockage.
In addition, since the present invention is a repair means that does not use a pressure replenishing device such as a compressor, Comparative Examples 2 and 3 show cases where pressure replenishment is performed by a compressor.

  The running ability after re-puncture was determined by allowing the tire to stand for 24 hours after running, then stepping out a 6 mmφ nail at a position different from the first injury and leaving it for 3 days. Thereafter, a maximum of 80 km was run at 60 km / h, and the running ability after re-puncturing was examined. Running after the second injuries (re-puncture), assuming that repairs are impossible, running without leaving the hollow particles and refilling with high-pressure gas at all for 3 days Carried out. In this situation, the mileage of 20 km or more was accepted as a premise, assuming direct access to the repair shop.

Note that the tire chamber pressure is adjusted to 200 kPa, which is the working internal pressure under no load, and high pressure air in the chamber is discharged to determine the amount of gas discharged, and the tire chamber volume is calculated. did. The calculation results are shown in Table 1.
Here, the measurement of the air volume of the tire was performed according to the following procedure.
[Measurement method of tire chamber volume]
Step 1: while maintaining the state in which that no load is the assembly of the tire and rim, filled with air at room temperature, a predetermined pressure (using pressure) is adjusted to P _2. In this case, the tire's air chamber volume of interest in P ₂ under and V _2.
Procedure 2: The tire valve is opened, and the air in the tire chamber is discharged to the atmospheric pressure P ₁ while flowing into the integrating flow meter, and the charged air discharge amount V ₁ is measured. As the integrating flow meter, DC DRY gas meter DC-2C, intelligent counter SSF manufactured by Shinagawa Seiki Co., Ltd. was used.
Using the above measured values,
Tire chamber volume value = (filled air discharge) / (internal pressure / atmospheric pressure) --- (II)
Accordingly, the tire chamber volume V ₂ at the use internal pressure P ₂ can be obtained.
In the formula (II), the internal pressure used was a gauge pressure value (kPa), and the atmospheric pressure value was an absolute value (kPa) measured by a barometer.

Moreover, the pressure in the hollow part of the hollow particle in the container arrange | positioned at the tire air chamber shown in Table 1 was measured as follows.
[How to check the pressure level in the hollow part]
A target container is prepared in which hollow particles are arranged in a container having a known volume and kept at a desired use internal pressure P ₂ for a certain period. By arranging a filter in the valve on the container, when the valve is opened, the hollow particles stay in the container, and only high-pressure gas is discharged. Then, once the pressure vessel and the atmospheric pressure, and adjusted to the pressure P _50% corresponding to 50% P ₂ in terms of gas-filled again, large air in the container by opening the valve on the container pressure While discharging to P ₁ , flow into the integrating flow meter and measure the air discharge V _50% . And the void volume value V (cm ³ ) around the particle under the following formula P _50% =
[Air discharge value V _50% (cm ³ )] / [Internal pressure value P _50% (kPa) / Atmospheric pressure P ₁ (kPa)]
Thus, the void volume value V around the particle at the pressure P _50% is obtained. Similarly, the void volume around the particles at each pressure level such as P _30%, P _70%, P _80%, P _90%, etc. is calculated. If the pressure inside the hollow portion is less than the pressure inside the container, the volume of the hollow particles decreases, and the void volume around the particles increases accordingly. Therefore, the above measurement was started from a sufficiently low pressure level, and the pressure level at which the void volume around the particle began to increase was defined as the pressure level in the hollow part of the hollow particle.

Furthermore, the method for measuring the average true specific gravity of the hollow particles is as follows.
[Measurement method of average true specific gravity]
The average true specific gravity value of the particles is generally measured by a liquid replacement method (Archimedes method), which is an ordinary method using isopropanol, and this ordinary method is also used in the present invention.

Moreover, the measuring method of the average particle diameter and particle size distribution of a hollow particle is as follows.
Instrument: Sympatec Gmbh Laser Diffraction Particle Size Analyzer HELOS & RODOS System Measurement conditions: 2S-100ms / DRY
Dispersion pressure: 2.00 bar, feed: 50.00%, rotation: 60.00%
Shape factor: 1.00
Measurement is performed under the above conditions, and the following measured values are adopted.
That is, the volume-based average particle size is set as the average particle size value (D50 value) of the present invention.

Furthermore, the measuring method of the thermal expansion start temperature Ts1 of each expandable resin particle and the reexpansion start temperature Ts2 of each hollow particle is as follows.
[Measurement method of thermal expansion start temperature of particles]
The thermal expansion start temperatures Ts1 and Ts2 in Table 2 were measured for the expansion displacement amount under the following conditions, and were defined as the temperatures at the rise of the displacement amount.
Equipment: PERKIN-ELMER 7Series
“Thermal Analysis System”
Measurement conditions: temperature increase rate 10 km / min, measurement start temperature 25 ° C., measurement end temperature 220 ° C.
Measurement physical quantity: Measures the amount of expansion displacement due to heating.

  In addition, on the inner surface of the rim of the assembly of the tire and rim to be evaluated, a pressure sensor that monitors the tire chamber pressure is incorporated, and the signal of the measured pressure data is transmitted by radio using a commonly used telemeter, A driving test was conducted while measuring changes in pressure by receiving the signal with a receiver installed inside the test vehicle.

  In Comparative Example 1, there is no inflow of high-pressure gas because the hollow part pressure of the hollow particles is low and the inside of the container is also atmospheric pressure. In addition, since the pressure was not replenished by the compressor, pressure increase due to heat generation from the tire was obtained after the first damage, but the clogging was not sufficient, and the internal pressure was restored due to the low pressure of the hollow part. There wasn't. Therefore, tire failure occurred early.

  In Comparative Examples 2 and 3, since the pressure was replenished by the compressor as compared with Comparative Example 1, it was possible to run after the first damage, but sufficient blockage was not obtained due to the low pressure in the hollow part, and 10 km. Tire internal pressure after running is low. Although there is a slight pressure increase due to heat generation from the tire, leakage from the damaged part is large. Further, in the second injury, as in the case of the first injury in Comparative Example 1, the failure occurred early.

  In Examples 1 and 2, the increased pressure due to the flow of the high-pressure gas in the container and the high pressure in the hollow portion enabled traveling after the first damage without refilling with a compressor. Also, some of the hollow particles expanded due to heat generation from the tire, and the internal pressure was restored. Even in the second injury, the pressure in the tire chamber was reduced by leaving it for three days, but since the pressure in the hollow portion was maintained, it was possible to run by restoring the internal pressure.

It is a figure which shows the repair point of a puncture tire. It is sectional drawing which shows the specific structure of the pressure vessel used by this invention. It is a figure which shows the example which mounted the modified example of a pressure vessel, and the valve | bulb with a filter. FIG. 3 is a cross-sectional view in the width direction of a tire after repair according to the present invention. It is a figure which shows an example of the "valve for tires provided with the filter" used together with the filling of a hollow particle and gas applied to the tire after repair according to this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rim 2 Tire 2a Tire air chamber 3 Pressure vessel 4 Hollow particle 5 Gas 6 Opening 7 Bead core 8 Carcass 9 Belt 10 Tread 11 Inner liner layer 12 Filter

Claims (18)

  When a tire mounted on a vehicle is damaged and an internal pressure is reduced to atmospheric pressure, a tire phase chamber partitioned by the vehicle mounted tire and the rim has a continuous phase made of a resin capable of thermal expansion. A high pressure gas and hollow particles are supplied from a pressure vessel containing a large number of hollow particles composed of closed cells in a high pressure gas higher than the working internal pressure of the tire, and the wound is closed with the hollow particles and then the hollow particles and the high pressure gas. A method for repairing puncture tires, characterized in that an internal pressure is applied. The puncture tire repair method according to claim 1, wherein a filling rate of the hollow particles according to the following formula (I) is 5 vol% or more and 100 vol% or less.
Filling ratio of hollow particles = (particle volume value / tire chamber volume value) × 100 --- (I)
here,
Particle volume value: The total volume of all the hollow particles placed in the tire chamber under the atmospheric pressure and the total void volume around the particles (cm ³ )
Tire chamber volume value: After filling the tire and rim assembly with air only and adjusting to the internal pressure (kPa), the amount of air discharged when the internal air is discharged until the internal pressure reaches atmospheric pressure (cm ³ ) using the following formula (II) (cm
³ )
Tire chamber volume value = (filled air discharge) / (internal pressure / atmospheric pressure) --- (II)
In the formula (II), the gauge pressure (kPa) is used for the internal pressure, and the absolute value (kPa) using a barometer is used for the atmospheric pressure value.   The puncture tire repair method according to claim 2, wherein a filling rate of the hollow particles is 10 vol% or more.   The puncture according to any one of claims 1 to 3, wherein inflatable resin particles in which a gas component is contained in a resin as a foaming agent in a liquid state are mixed with the hollow particles, and the tire air chamber is filled. How to repair a tire.   The puncture tire repair method according to any one of claims 1 to 4, wherein a thermal expansion start temperature Ts2 of the hollow particles is 40 to 200 ° C.   The puncture tire repair method according to any one of claims 1 to 5, wherein a thermal expansion start temperature Ts2 of the hollow particles is 40 to 150 ° C.   The puncture tire repair method according to any one of claims 1 to 6, wherein a thermal expansion start temperature Ts2 of the hollow particles is 40 to 120 ° C.   The puncture tire repair method according to any one of claims 1 to 7, wherein a thermal expansion start temperature Ts2 of the hollow particles is 40 to 100 ° C.   The puncture tire repair method according to any one of claims 1 to 8, wherein the hollow particles are used by adjusting the pressure in the hollow portion to 70% or more of the working internal pressure of the tire.   The puncture tire repair method according to any one of claims 1 to 9, wherein the hollow particles are used by adjusting the pressure in the hollow portion to 80% or more of the working internal pressure of the tire.   The puncture tire repair method according to any one of claims 1 to 10, wherein the hollow particles are used by adjusting the pressure in the hollow portion to 90% or more of the working internal pressure of the tire.   The method for repairing a puncture tire according to any one of claims 1 to 11, wherein the hollow particles are used by adjusting the pressure in the hollow portion to 100% or more of the use internal pressure of the tire. The average particle size of the hollow particle group filled in the tire chamber is in the range of 40 to 200 μm, and the average true specific gravity of the hollow particle group is in the range of 0.01 to 0.06 g / cm ^3. The puncture tire repair method according to any one of claims 1 to 12. The gas in the hollow part of the hollow particles is nitrogen, air, linear and branched aliphatic hydrocarbons having 2 to 8 carbon atoms and fluorinated products thereof, alicyclic hydrocarbons having 2 to 8 carbon atoms and fluorinated products thereof. And the following general formula (III):
R ¹ —O—R ² ---- (III)
(Wherein R ¹ and R ² are each independently a monovalent hydrocarbon group having 1 to 5 carbon atoms, and part of the hydrogen atoms of the hydrocarbon group may be replaced by fluorine atoms) The puncture tire repair method according to claim 1, wherein the repair method is at least one selected from the group consisting of ether compounds represented by:   The resin as the continuous phase of the hollow particles is composed of at least one of a polyvinyl alcohol resin, an acrylonitrile polymer, an acrylic polymer, and a vinylidene chloride polymer. Repair method for puncture tires described in 1.   The continuous phase of the hollow particles consists of an acrylonitrile polymer, which is an acrylonitrile polymer, an acrylonitrile / methacrylonitrile copolymer, an acrylonitrile / methyl methacrylate copolymer, an acrylonitrile / methacrylonitrile / methyl methacrylate ternary copolymer. The puncture tire repair method according to any one of claims 1 to 15, wherein the repair method is at least one selected from a polymer and an acrylonitrile / methacrylonitrile / methacrylic acid terpolymer.   2. A large number of foams whose average bulk specific gravity under atmospheric pressure is larger than the average true specific gravity of the hollow particles are arranged in the tire chamber, and are mixed with the hollow particle group for closing the wound. The repair method of the puncture tire in any one of thru | or 16.   The foam has a substantially spherical shape with a diameter of 1 to 15 mm or a cubic shape with a side of 1 to 15 mm, an average bulk specific gravity of 0.06 to 0.3 (g / cc), and closed cells or open cells. The puncture tire repair method according to claim 17, wherein the puncture tire repair method is provided.

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