JP2010037521A - Puncture sealant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a puncture sealant which forms a coagulant difficult to come off from a punctured hole. <P>SOLUTION: The puncture sealant includes at least one kind of adhesives selected from the group consisting of natural resin, modified rosin resin, terpene-modified resin, aliphatic hydrocarbon resin, cyclopentadiene resin, alkylphenol-acetylene resin, styrenic resin, xylene resin, coumarone-indene resin, and vinyltoluene-α-methylstyrene copolymer, and latex. Preferably, the mass of the adhesive is not less than 55 mass% and not more than 200 mass% to the total mass of the solid of the latex. Preferably, when the puncture sealant is coagulated, the coagulum has tensile strength of not less than 0.05 MPa and not more than 10 MPa and hardness of not less than 20 degree and not more than 150 degree. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a puncture sealant.

  The puncture sealant, which is a repair agent for sealing the occurrence of puncture, is (1) puncture sealability that seals punctured tire holes, which is the original function of the puncture sealant, (2) From the viewpoint of lowering the viscosity of the puncture sealant and facilitating the injection of the puncture sealant from a valve, etc., (3) Some degree of antifreeze that can be used even in a low temperature environment, (4) Long-term storage Possible storage stability is required.

  The puncture hole of the tire is repeatedly opened and closed by the rotation of the tire, and when it is closed, a large share is applied to the wall surface of the puncture hole. When a puncture sealant is injected into a punctured tire, the puncture holes are filled with the puncture sealant, and the puncture sealant in the puncture holes is solidified into a gel due to the share. The repair of the tire is completed by plugging the puncture hole with the gelled rubber latex.

Conventional puncture sealants have many inventions aimed at solving various problems until the puncture sealant plugs the puncture hole in response to the above-described requirements. In other words, the viscosity of the puncture sealant is lowered to facilitate injection of the puncture sealant from the tire valve, and long-term storage stability is prevented so that the puncture sealant does not solidify before injection into the tire. A puncture sealant is disclosed.
For example, at least synthetic rubber for the purpose of storability to increase the puncture sealing speed, shorten the time from filling the puncture sealant into the tire and closing the puncture hole, and not to solidify even after long-term storage There has been disclosed a puncture sealing agent containing latex and defining a gelation rate in a Malone mechanical stability test in accordance with JIS-K6387 (see, for example, Patent Document 1).
JP 2006-152239 A

  However, even if the storage stability is improved and the puncture hole can be closed immediately, the repair of the tire is completed if the gel-like plug that has closed the puncture hole is deformed during running or the plug is removed. I can't say that.

  An object of this invention is to provide the puncture sealing agent which can form the solidified substance which is hard to remove | deviate from a puncture hole in view of the said situation.

As a result of intensive studies to achieve the above object, the present inventors have found that the object can be achieved by the following present invention.
That is, the present invention relates to natural resins, modified rosin resins, terpene modified resins, aliphatic hydrocarbon resins, cyclopentane diene resins, alkylphenol acetylene resins, styrene resins, xylene resins, coumarone / indene resins, and vinyl toluene. A puncture sealing agent containing at least one pressure-sensitive adhesive selected from the group consisting of an α-methylstyrene copolymer and latex.

  By configuring the puncture sealant of the present invention as described above, the strength of the solidified product obtained by solidifying the puncture sealant is improved, and the solidified product (also referred to as “gel plug”) is deformed even if it receives a share from the tire. Therefore, the gel stopper fitted in the puncture hole can be made difficult to come off from the puncture hole. In addition, since the gel plug is not easily deformed, it is possible to prevent air from leaking from a gap generated between the hole wall of the puncture hole and the gel plug.

  In the puncture sealing agent of the present invention, the mass of the pressure-sensitive adhesive is preferably 55% by mass or more and 200% by mass or less with respect to the total mass of the solid content of the latex. A puncture sealing agent having a tensile strength of 0.05 MPa to 10 MPa and a hardness of 20 degrees to 150 degrees is preferable.

  ADVANTAGE OF THE INVENTION According to this invention, the puncture sealing agent which can form the solidified substance which cannot be easily removed from a puncture hole can be provided.

<Punk sealing agent>
The puncture sealant of the present invention includes natural resins, modified rosin resins, terpene modified resins, aliphatic hydrocarbon resins, cyclopentanediene resins, alkylphenol acetylene resins, styrene resins, xylene resins, coumarone / indene resins, and It contains at least one pressure-sensitive adhesive selected from the group consisting of vinyltoluene-α-methylstyrene copolymer and latex.

  The puncture sealant of the present invention can further contain antifreeze and other components as long as the effects of the present invention are not impaired. Hereinafter, each component which the puncture sealing agent of this invention may contain is demonstrated.

[Adhesive]
The puncture sealant of the present invention includes natural resins, modified rosin resins, terpene modified resins, aliphatic hydrocarbon resins, cyclopentanediene resins, alkylphenol acetylene resins, styrene resins, xylene resins, coumarone / indene resins, and It contains at least one pressure-sensitive adhesive selected from the group consisting of vinyltoluene-α-methylstyrene copolymers.
Hereinafter, natural resin, modified rosin resin, terpene modified resin, aliphatic hydrocarbon resin, cyclopentane diene resin, alkylphenol acetylene resin, styrene resin, xylene resin, coumarone / indene resin, and vinyltoluene-α-methylstyrene At least one pressure-sensitive adhesive selected from the group consisting of copolymers is referred to as “specific pressure-sensitive adhesive” as appropriate.

  The specific adhesive has good compatibility with latex and can increase the strength (hardness and tensile strength) of the solidified product obtained when the puncture sealing agent is solidified without increasing the ratio of the specific adhesive to the latex. . Therefore, it is possible to realize a puncture sealing agent capable of obtaining a solidified product (gel plug) that is difficult to come off from the puncture hole when the puncture hole is repaired.

Specific examples of the specific adhesive include the following.
Examples of the natural resin include rosin and dammar, and examples of the modified rosin resin include partial water lacquer rosin. Examples of the terpene modified resin include α-pinene polymer, β-pinene polymer, terpene phenol, and dipentene. Phenol etc. are mentioned. Examples of the aliphatic hydrocarbon resin include olefins and olefin polymers.

  Among the above, the specific adhesive is a natural resin, an aliphatic hydrocarbon resin, a cyclopentane diene resin, an alkylphenol acetylene resin, a styrene resin, a xylene resin, a coumarone / indene resin, and vinyltoluene-α-methylstyrene. It is preferably at least one selected from the group consisting of copolymers, and in particular a ditenpen polymer.

  As the specific adhesive, only one of the above groups may be used, or two or more may be used in combination.

The puncture sealing agent of the present invention is based on the total mass of the solid content of the latex (also referred to as “latex solid content”) from the viewpoint of further improving the strength of the solidified product (gel) obtained by coagulation of the puncture sealing agent. It is preferable to contain 55 to 200% by weight of a specific pressure-sensitive adhesive, and by setting it in the above range, the coagulated product (gel plug) is more difficult to deform even when receiving a large share from the tire. be able to.
If the mass of the specific pressure-sensitive adhesive is 55% by mass or more with respect to the total mass of the latex solids, sufficient strength of the gel plug can be obtained, and if it is 200% by mass or less, the relative amount of latex solids is too small. It is possible to suppress poor solidification of the puncture sealant.

  When the mass of the specific pressure-sensitive adhesive is less than 55% by mass with respect to the total mass of the solid content of the latex, the ratio of the specific pressure-sensitive adhesive to the latex is small, and the puncture sealing agent that has entered the puncture holes is difficult to solidify early. Moreover, when the mass of the specific pressure-sensitive adhesive exceeds 200 mass% with respect to the total mass of the solid content of the latex, the puncture sealing agent becomes hard, and the puncture sealing agent cannot be fitted into the puncture hole, and the puncture seal May be insufficient.

  The pressure-sensitive adhesive is preferably used as a pressure-sensitive adhesive emulsion in consideration of the miscibility with latex described later and the improvement in puncture sealing. The pressure-sensitive adhesive emulsion can be obtained by mixing the specific pressure-sensitive adhesive, an emulsifier, and a dispersion medium (for example, water, alcohol, etc.).

The pressure-sensitive adhesive emulsion includes an anionic surfactant such as alkyl sulfate, alkyl benzene sulfonate, and aliphatic carboxylate as an emulsifier, and a cationic surfactant such as alkyl amine salt and alkyl quaternary ammonium salt. Nonionic surfactants such as sucrose fatty acid ester, polyoxyethylene alkyl ether, and fatty acid polyethylene glycol can be used.
Among these, nonionic surfactants are preferable from the viewpoint of storage stability of the puncture sealing agent.

  When using an adhesive as an adhesive emulsion, it is preferable that content of the adhesive in an adhesive emulsion is 5 mass%-90 mass%, and it is more preferable that it is 20 mass%-70 mass%.

  The content of the adhesive emulsion is preferably 3% by mass to 30% by mass, more preferably 5% by mass to 25% by mass, and more preferably 7% by mass to 20% by mass with respect to the total mass of the puncture sealing agent. More preferably, it is mass%. By setting the content to 3% by mass to 30% by mass, a practical and good sealing property can be exhibited.

  In the present invention, “pressure-sensitive adhesive” refers to a solid pressure-sensitive adhesive, and “mass of pressure-sensitive adhesive” refers to the mass of the pressure-sensitive adhesive. When the pressure-sensitive adhesive is used as the pressure-sensitive adhesive emulsion, the mass of the pressure-sensitive adhesive with respect to the total mass of the latex solid content is calculated with the solid content mass of the pressure-sensitive adhesive emulsion as “mass of the pressure-sensitive adhesive”.

〔latex〕
The puncture sealant of the present invention contains latex. The type of latex is not particularly limited, and at least one selected from NR (natural rubber) latex, synthetic rubber latex, and synthetic resin latex can be used.

  Examples of the synthetic rubber latex include SBR (styrene butadiene rubber) latex, NBR (nitrile rubber) latex, MBR (acrylic rubber) latex, BR (polybutadiene rubber) latex, IIR (butyl rubber) latex, CR latex, IR latex, and Examples thereof include polysulfide rubber latex.

  Synthetic resin latex includes carboxy-modified NBR latex, carboxy-modified SBR latex, acrylic ester latex, styrene / butadiene / resin latex, vinyl acetate latex, polyvinyl acetate latex, vinyl chloride latex, polyvinyl chloride latex, vinylidene chloride latex, Examples thereof include polyvinylidene chloride latex and polystyrene latex.

  Among these, it is preferable to use a synthetic rubber latex from the viewpoint of lowering the viscosity of the puncture sealant in combination with a monohydric alcohol. Furthermore, SBR (styrene butadiene rubber) latex or BR (polybutadiene rubber) latex is more preferable, and BR (polybutadiene rubber) latex is particularly preferable.

The content of the latex is preferably 20% by mass to 60% by mass and more preferably 30% by mass to 50% by mass with respect to the total mass of the puncture sealing agent.
Moreover, it is preferable to set it as 5 mass%-40 mass% with respect to the total mass of a puncture sealing agent, and, as for content of latex solid content, it is more preferable to set it as 10 mass%-30 mass%.

  The latex solid content in the latex is preferably 5% by mass to 90% by mass and more preferably 20% by mass to 70% by mass with respect to the total mass of the latex.

<Coagulum>
The puncture sealant of the present invention is preferably a puncture sealant that, when solidified, has a tensile strength of the solidified product of 0.05 MPa to 10 MPa and a hardness of 20 degrees to 150 degrees.
In the present invention, the “coagulated product” is a component that can constitute the gel plug when the puncture sealing agent of the present invention is coagulated (gelled), and is mainly composed of the specific adhesive and the latex solid content. Is done. When the puncture sealing agent of the present invention further contains other components such as short fibers and fillers, which will be described later, solid components among other components such as the short fibers and fillers are also referred to as the “coagulum”. It can be a constituent component.

  When the inside of the puncture sealing agent of the present invention is solidified, the solidified product has a tensile strength of 0.05 MPa or more and 10 MPa or less, and a hardness of 20 degrees or more and 150 degrees or less, whereby the puncture sealing agent is solidified and gel plugs. When the is formed, the strength of the gel plug is increased, and even if it receives a large share from the tire, it is difficult to deform.

In the present invention, the “tensile strength of a solidified product” is obtained when a sample obtained by solidifying (solidifying) a puncture sealant in an oven at 130 ° C. for 3 hours is measured using a tensile tester. Value.
The “hardness of the solidified product” refers to a value obtained when a sample obtained by solidifying (solidifying) a puncture sealing agent in an oven at 130 ° C. for 3 hours is measured using a hardness meter. .

〔water〕
The puncture sealant of the present invention can contain water.
Water can be used as a dispersion medium when the specific pressure-sensitive adhesive is used as a pressure-sensitive adhesive emulsion, but can also be used for diluting the puncture sealing agent.
From the viewpoint of the viscosity of the puncture sealing agent, the water content is preferably 5% by mass to 90% by mass and more preferably 30% by mass to 70% by mass with respect to the puncture sealing agent of the present invention. preferable.

〔antifreeze〕
The puncture sealing agent of the present invention preferably contains an antifreeze solution.
The antifreeze liquid is not particularly limited as long as it has a function of preventing freezing of the puncture sealing agent when the puncture sealing agent is used in a cold region.
For example, monohydric alcohol and dihydric alcohol can be used, and examples thereof include ethanol, 1-propanol, ethylene glycol, and propylene glycol. The alcohol may be linear, branched or cyclic, and among these, a monovalent alcohol having 1 to 5 carbon atoms is preferable from the viewpoint of reducing the viscosity of the puncture sealing agent.

  The content of the antifreeze is not particularly limited, but is preferably 5% by mass to 90% by mass with respect to the total mass of the puncture sealing agent from the viewpoint of antifreezing property at low temperatures. More preferably, it is 10 mass%-70 mass%.

[Other ingredients]
The puncture sealing agent of the present invention can further contain other components such as short fibers and fillers as long as the effects of the puncture sealing agent of the present invention are not impaired.

(Short fiber)
The puncture sealing agent of the present invention may further contain short fibers.
The short fibers enter holes and holes (defects) generated in the tire due to puncture and cause clogging, and serve to close these holes and holes quickly and reliably.

The short fiber content is preferably 0.1% by mass to 5% by mass with respect to the total mass of the puncture sealing agent. If it is 0.1% by mass or more, the sealing property due to the addition of the short fibers can be sufficiently exhibited, and if it is 5% by mass or less, the entanglement of the short fibers can be prevented and the viscosity hardly increases. The ease of injection of the puncture sealing agent is improved, and the role of the puncture sealing agent described above is sufficiently exerted.
The content of the short fiber is preferably 0.3% by mass to 4% by mass, and more preferably 0.5% by mass to 3% by mass with respect to the total mass of the puncture sealing agent.

  In order to sufficiently exert the above-described role for the puncture sealant, various designs need to be made for the short fibers. Therefore, the specific gravity (S), length (L), diameter (D), and ratio of length to diameter (L / D) of the short fibers are preferably set in the following ranges, respectively.

(1) Specific gravity (S): 0.8 ≦ S ≦ 1.4 (more preferably 0.9 ≦ S ≦ 1.3, and still more preferably 1.0 ≦ S ≦ 1.2).
If the specific gravity is less than 0.8, the short fibers may float upward and the long-term separation stability may be low. If the specific gravity exceeds 1.4, the short fibers may sink and the long-term separation stability may be lowered. May be low.

(2) Length (L): 0.05 ≦ L ≦ 10 mm (more preferably 0.08 ≦ L ≦ 8 mm, still more preferably 0.1 ≦ L ≦ 6 mm).
If the length is less than 0.05 mm, the short fiber may not fully exhibit the effect of causing clogging in the defective portion due to puncture and improving the sealing property. Therefore, the sealing performance may be reduced.

(3) Diameter (D): 1 ≦ D ≦ 100 μm (more preferably 3 ≦ D ≦ 80 μm, still more preferably 5 ≦ D ≦ 50 μm).
If the diameter (thickness) is less than 1 μm, the role of short fibers that cause clogging and improve the sealing performance may not be sufficiently exhibited. If the diameter (thickness) exceeds 100 μm, the relative number of short fibers may not be achieved. May decrease the sealing performance.

(4) Ratio of length to diameter (L / D): 5 ≦ L / D ≦ 2000 (more preferably 20 ≦ L / D ≦ 1600, more preferably 50 ≦ L / D ≦ 1200, particularly preferably 100 ≦ L / D ≦ 300).
If L / D is less than 5, the role of short fibers that cause clogging and improve sealability may not be sufficiently exhibited. If L / D exceeds 2000, lumps of short fibers may occur. , May cause deterioration of sealability and ease of injection.

  In addition, short fibers made of one material can be used in a certain shape, but short fibers made of a plurality of materials can be used in various shapes within the range described above.

  The short fiber is not particularly limited in its material, but is preferably composed of polyester, polyethylene, nylon, polypropylene, or a composite of two or more thereof, polyethylene, nylon, polypropylene, and a composite of two or more of these. It is more preferable that it consists of either. By using such short fibers, better separation stability can be obtained.

It is preferable that the short fiber is treated with a solvent such as a higher alcohol derivative and / or a betaine activator in the whole amount or a part thereof (preferably the whole amount). By this treatment, the solvent acts as an active agent, and the dispersibility of the short fibers can be improved.
The treatment may be performed before or after inclusion in the puncture sealant. The treatment can be carried out by impregnating the short fiber with the solvent or spraying the solvent. As the higher alcohol derivative, polyglycol polyester is suitable.

  The amount of the solvent added (the amount absorbed by the short fiber by the above treatment) is preferably 0.2% by mass to 20% by mass, and 0.5% by mass to 10% by mass of the short fiber mass. Is more preferable, and it is further more preferable that it is 1 mass%-6 mass%. If it is the said range, sufficient dispersion | distribution effect of a short fiber will be acquired, the said process is favorable, and the improvement of an effect can be anticipated.

(Filler)
Also, one or more fillers may be mixed with the puncture sealant so that it can be quickly sealed and reliably sealed even with large holes. Examples of stable fillers include, for example, synthetic resin reinforced with silicic acid, chalk, carbon black, glass fiber, polystyrene particles, powdered rubber by pulverization of vulcanized products such as tires, sawdust, moslaver particles, foam particles for cut flowers Etc. can be adopted. Among these, particularly preferred fillers are rubber powder bonded with silicic acid, and synthetic resin reinforced with glass fiber.

  The filler can be added directly to the puncture sealant. However, as long as the filler has a size that makes it difficult or impossible to guide the puncture sealant through the valve without changing the valve size, these fillers generally rim the tire. Sometimes it is introduced into the inside of the tire, and when a puncture occurs in the tire, a puncture sealing agent is injected to achieve sealing.

  The filler is preferably added to the puncture sealant at about 20 g / liter to 200 g / liter, more preferably 60 g / liter to 100 g / liter, or disposed inside the tire in the tire rim set.

(Other additives)
In the puncture sealing agent of the present invention, an ordinary dispersant, emulsifier, foam stabilizer, caustic soda, and other pH adjusters may be added to the puncture sealant.

[Solid component of puncture sealant]
In the puncture sealing agent of the present invention as described above, the content of the solid component in the puncture sealing agent is preferably 5% by mass to 70% by mass with respect to the total mass of the puncture sealing agent.

  The content of the solid component in the puncture sealing agent can be determined as follows. First, 10 g of the puncture sealant is left at 140 ° C. for 4 hours. It can be determined by measuring the mass of the residue after standing and dividing the mass of the residual by the mass of the puncture sealing agent (mass of residual amount / mass of the puncture sealing agent before leaving).

If the content of the solid component in the puncture sealant is 5% by mass or more with respect to the total mass of the puncture sealant, sufficient sealing properties can be secured. Moreover, if it is 70 mass% or less, characteristics other than a sealing property can fully be ensured.
The upper limit with more preferable content of the solid component in a puncture sealing agent within the said range is 60 mass%, More preferably, it is 50 mass%, Especially preferably, it is 40 mass%. Moreover, the more preferable minimum of content of the solid component in a puncture sealing agent within the said range is 8 mass%, More preferably, it is 10 mass%.

[Production method of puncture sealant]
The puncture sealant can be produced by mixing the above-described materials by a known method. As described above, the specific pressure-sensitive adhesive is preferably used as a pressure-sensitive adhesive emulsion, and a puncture sealing agent is produced by mixing the latex, the pressure-sensitive adhesive emulsion, and antifreeze liquid, short fibers, filler, and the like as necessary. be able to.
The production, storage, and filling of the puncture sealing agent is preferably performed in an atmosphere of nitrogen or a rare gas in order to avoid oxidation and the like.

[Viscosity of puncture sealant]
The viscosity of the puncture sealant is 3 mPa · s to 20,000 mPa · s under the conditions assumed as actual use conditions (at least in the range of 60 ° C. to −60 ° C. before filling the tire). Is more preferably 5 mPa · s to 4,500 mPa · s, further preferably 8 mPa · s to 3,000 mPa · s, particularly preferably 10 to 3,000 mPa · s, Most preferably, it is ˜1,500 mPa · s.

If the viscosity of the puncture sealant is 3 mPa · s or more, liquid leakage at the time of injection into the valve can be prevented. If it is 20,000 mPa · s or less, the resistance at the time of injection can be suppressed, so that the ease of injection can be prevented and the spread to the tire inner surface can be sufficiently increased. Sealability is obtained.
The viscosity of the puncture sealant can be measured with a B-type viscometer or the like.

[Production method of puncture sealant]
The puncture sealant can be produced by mixing the above-described materials by a known method. The production, storage, and filling of the puncture sealing agent is preferably performed in an atmosphere of nitrogen or a rare gas in order to avoid oxidation and the like.

[How to repair punctures with puncture sealants]
As a puncture repair method using the puncture sealing agent as described above, a known method can be applied. That is, first, a container filled with a puncture sealing agent is inserted into a valve opening of a tire and an appropriate amount is injected. Thereafter, the tire may be rotated so that the puncture sealing agent spreads on the inner surface of the tire and seals the puncture holes.

  Such a puncture sealant itself can be introduced into the inside of a tire by using various pump-up devices, for example, a spray can containing a mixed gas of propane and butane as a fuel gas, and is shown in FIG. The pump-up device 20 can be used more preferably.

  In the pump-up device 20 shown in FIG. 1, a small air compressor 1 is used as the pressure source. This air compressor 1 is connected to a gas introduction part 3 of a pressure vessel 4 via a hose 2. The gas introduction part 3 is formed as a riser tube that can be closed by a stopper valve 5 and extends to the liquid level of the puncture sealing agent 6 accommodated in the pressure resistant container 4.

  The pressure vessel 4 has an outlet valve 7 for taking out the puncture sealing agent 6. One end of a hose 8 is connected to the outlet valve 7, and the other end of the hose 8 is connected to a tire valve 10. A screw adapter 9 to be screwed is attached.

The pressure vessel 4 has a filling stub 12 and a jacket 11 filled with water. The filling stub 12 can be filled with calcium chloride as a heating source as required. When the puncture sealant 6 is frozen at a low temperature, the puncture sealant 6 is heated to an available temperature by the heat released by the hydration action of the heating source.
An electric cable 13 is connected to the air compressor 1, and its plug 14 is inserted into a cigarette lighter, for example.

  When puncture occurs in the tire, the screw adapter 9 is screwed to the tire valve 10, the air compressor 1 is connected to the cigarette lighter, and the plug valve 5 is opened in the gas introduction part 3 of the pressure vessel 4. The compressed air introduced from the air compressor 1 into the pressure vessel 4 through the gas introduction part 3 pushes out the puncture sealing agent 6 from the outlet valve 7 and introduces the tire valve 10 into the inside of the tire. Thereafter, air is refilled into the tire, causing the tire to inflate at a specific internal pressure. When this is finished, the screw adapter 9 is removed from the tire valve 10 and the air compressor 1 is stopped. Immediately after this, after preliminarily traveling for a certain distance and sealing the puncture hole while spraying the puncture sealing agent 6 inside the tire, the pump-up device 20 is connected again and the tire is pumped again to the required internal pressure. Up.

  Further, the puncture sealing agent of the present invention can be more preferably used by the pump-up device 30 shown in FIGS. 2A and 2B. In the pump-up device shown in FIGS. 2A and 2B, portions common to the pump-up device 20 shown in FIG.

  The pump-up device 30 includes a resin bottle 22 that is a container for the puncture sealing agent 6 shown in FIG. 2A, and an air compressor 1 as a pressure source shown in FIG. 2B. The bottle 22 contains the puncture sealing agent 6 necessary for one puncture repair. A hose 24 having an adapter 26 disposed at the tip is connected to the bottle 22. An adapter 9 is also arranged at the tip of the hose 2 connected to the air compressor 1. However, the adapter 9 may be omitted as long as the hose 24 of the bottle 22 can be directly connected to the tire valve 26.

  When the puncture occurs, the adapter 26 of the bottle 22 is screwed to the tire valve 10. Thereby, it communicates in the tire through the hose 24 and the adapter 26. In this state, as shown by a two-dot chain line (imaginary line) in FIG. 2A, the operator squeezes the bottle 22 and squeezes the puncture sealing agent 6 out of the bottle 22, so 6 is injected into the tire.

  When the injection of the puncture sealing agent 6 from the bottle 22 into the tire is completed, the operator removes the adapter 22 from the tire valve 10 and separates the bottle 22 from the tire.

  Next, the operator screws the adapter 9 of the air compressor 1 to the tire valve 10 and causes the air compressor 1 to communicate with the tire through the adapter 9 and the hose 2. In this state, the operator operates the air compressor 1 to refill the tire with pressurized air, and inflates the tire with a specific internal pressure. When this is finished, the operator removes the adapter 9 from the tire valve 10 and stops the air compressor 1. Immediately after this, after preliminarily traveling for a certain distance and sealing the puncture hole while spraying the puncture sealing agent 6 inside the tire, the operator reconnects the air compressor 1 of the pump-up device 30 and removes the tire. Pump up again to the required internal pressure.

  The puncture sealant of the present invention can be applied to puncture repair of various pneumatic tires. Examples thereof include automobile tires, motorcycle tires, unicycle tires, wheelchair tires, vehicle tires used for farmland work and garden work, and the like.

  EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these.

[Preparation of puncture sealant]
A puncture sealing agent was prepared by mixing the components shown in Table 1 below. In Table 1, the unit of “solid content” and “amount” is “mass%”. In Table 1, “PG” represents propylene glycol, and the details of the pressure-sensitive adhesive used for the preparation of each puncture sealing agent are as follows.

・ Modified rosin; Glycerin ester rosin / terpene series; Terpene phenol / aliphatic hydrocarbon series; Olefin polymer / styrene series; Styrene resin / xylene series; Xylene resin / coumarone / indene series; Coumarone / indene resin / vinyl toluene series; Vinyltoluene-α-methylstyrene copolymer / natural resin rosin

  In Table 1 below, “ratio” is the mass of the pressure-sensitive adhesive with respect to the total solid content of the latex in the puncture sealing agent, and the unit is “mass%”.

[Evaluation]
1. Hardness The obtained puncture sealant was allowed to stand in an oven at 130 ° C. for 3 hours to solidify to obtain a sample. The hardness of the obtained sample was measured using a hardness meter. The results are shown in Table 1 below.

2. Tensile strength The obtained puncture sealant was allowed to solidify in an oven at 130 ° C. for 3 hours to obtain a sample. The tensile strength of the obtained sample was measured using a tensile tester. The results are shown in Table 1 below.

3. Puncture sealing property A hole with a diameter of 2.3 mm was drilled in a tire tread groove portion of one tire, and the produced puncture sealing agent was injected and mounted on a car. Thereafter, the car was run at about 50 km / h while maintaining the air pressure of 0.2 MPa, and the puncture sealability was evaluated according to how many kilometers the seal was completed. Specific criteria are as follows.
A: Sealing completed at less than 5 km.
○: It took 5 km or more and less than 10 km to complete the seal.
Δ: It took 10 km or more to complete the seal.
X: Cannot be sealed.
The results are shown in Table 1 below.

  As can be seen from Table 1, the puncture sealing agents of Examples 1 to 13 had higher hardness and tensile strength of the sample (coagulated product) than that of Comparative Examples 1 and 2, and good sealing performance.

It is the schematic which shows an example of the sealing and pump-up apparatus used in order to fill a tire with the puncture sealing agent which concerns on embodiment of this invention. It is the schematic which shows the other example of the sealing pump-up apparatus used in order to fill a tire with the puncture sealing agent which concerns on embodiment of this invention.

Explanation of symbols

3 Gas introduction part 4 Pressure vessel 6 Sealing agent 7 Outlet valve 20 Pump-up device 30 Pump-up device

Claims (3)

  Natural resin, modified rosin resin, terpene modified resin, aliphatic hydrocarbon resin, cyclopentane diene resin, alkylphenol acetylene resin, styrene resin, xylene resin, coumarone / indene resin, and vinyltoluene-α methylstyrene copolymer A puncture sealing agent comprising at least one pressure-sensitive adhesive selected from the group consisting of a coalescence and latex.   The puncture sealing agent according to claim 1, wherein the pressure-sensitive adhesive has a mass of 55% by mass or more and 200% by mass or less based on the total mass of the solid content of the latex.   The puncture sealing agent according to claim 1 or 2, wherein when solidified, the tensile strength of the solidified product is 0.05 MPa or more and 10 MPa or less and the hardness is 20 degrees or more and 150 degrees or less.

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