JP2012007138A - Puncture sealing agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a puncture sealing agent which can quickly seal even a puncture hole due to a thick nail of about 4 mm in diameter or the like, and sustains the sealing effect during running and after running.SOLUTION: The puncture sealing agent to seal punctured holes of tires is constituted of a natural rubber latex, an antifreezing agent, an ether-type nonionic surfactant, and a resin particle. The content of the natural rubber latex is preferably 5 to 30 wt.%; the content of the antifreezing agent is preferably 5 to 60 wt.%; the content of the ether-type nonionic surfactant is preferably 0.1 to 1 wt.%; and the content of the resin particle is preferably 0.1 to 5 wt.%.

Description

  The present invention relates to a puncture sealant for sealing a hole in a punctured tire.

  When light puncture occurs in a tire due to a nail or the like, a puncture sealing agent for injecting the inside of the tire and sealing a puncture hole has been proposed for emergency repair (for example, Patent Documents 1 to 3). .

  However, the conventional rubber latex puncture sealant mainly uses natural rubber latex or synthetic rubber latex such as synthetic isoprene rubber (IR), acrylonitrile-butadiene rubber (NBR), and the following problems Had a point.

  1) The puncture sealant mainly composed of rubber latex may not be able to seal quickly, and if it takes a long time to seal, the puncture sealant that continues to blow out from the puncture hole There was a problem of polluting the car body and roads.

  2) The puncture sealant mainly composed of rubber latex has a high latex concentration (40% or more) and may cream during storage.

  3) Antifreeze is added for the purpose of enabling repair in cold conditions, but the stability of latex is impaired by the addition of antifreeze. In order to ensure it, the addition amount of the antifreezing agent had to be kept within a certain range, and therefore the use limit was around −30 ° C.

  4) Those that exhibit a sealing effect with water-soluble polymers, resin particles, and fibers have a quick sealing effect on puncture holes, but the sealing effect may be reduced while the vehicle is stopped after traveling, and refilled with air. There was a need to do.

Japanese Patent No. 3210863 Japanese Patent No. 3802212 JP 2009-138112 A

  An object of the present invention is to provide a puncture sealing agent that solves the problems of the conventional puncture sealing agent as described above, can obtain a quick sealing effect, and maintains the sealing effect even when traveling is stopped. .

  As a result of intensive studies to solve the above-mentioned problems, the present inventor has used natural rubber latex at a low concentration, and contained a freezing inhibitor, an ether-type nonionic surfactant, and resin particles to puncture. When constructing a sealing agent, it has been found that the above problems can be solved, and the present invention has been completed.

  That is, the present invention is a puncture sealing agent for sealing a hole in a punctured tire, characterized by containing a natural rubber latex, an antifreezing agent, an ether type nonionic surfactant, and resin particles. It is a puncture sealant.

  The present invention is a tire puncture sealant characterized in that the natural rubber latex is 5 to 30% by weight.

  The present invention is a tire puncture sealing agent characterized in that the ether type nonionic surfactant is 0.1 to 1% by weight.

  In the present invention, the resin particles are EVA (ethylene vinyl acetate), PVC (polyvinyl chloride) or powder rubber particles, and the content thereof is a puncture sealant for a tire having a content of 0.1 to 5% by weight.

  According to the puncture sealing agent of the present invention, puncture holes can be quickly sealed. The puncture sealant of the present invention can be used even under a low temperature condition of −40 ° C. As a result, the usable temperature range can be expanded to a wide range of −40 ° C. to + 70 ° C.

  As described above, the puncture sealing agent of the present invention contains four components of natural rubber latex, an antifreezing agent, an ether type nonionic surfactant, and resin particles as essential components. The natural rubber latex and the resin particles act as a blocking material for preventing air (air) leakage from the puncture hole. Ether type nonionic surfactants work to make the natural rubber latex stable.

  When this natural rubber latex is used at 5 to 30% by weight, it tends to be more stable than that used at an ordinary 40 to 60% by weight. A stable state can be made by adding 0.1 to 1% by weight of an ether type nonionic surfactant.

  Resin particles have the effect of speeding up the blocking effect when used with natural rubber latex. Normally, natural rubber latex diluted with other components has a low effect as an occluding material, but a rapid occluding effect can be obtained by using resin particles as nuclei.

  The resin particles are for quickly closing the puncture holes, and one or more resin particles may be mixed in the puncture sealant. Examples of the resin particles include EVA (ethylene-vinyl copolymer) resin, polyester resin, and powder rubber. Particularly, EVA resin, powder rubber and the like are preferable, but not limited thereto, for example, polycarbonate resin, methacrylic resin, polystyrene resin, ABS resin, vinyl chloride resin, PET (polyethylene terephthalate) resin, polyamide resin, polyurethane resin, As the polyamide resin, nylon 6, nylon 66, nylon 12, or the like can be used. In addition, fiber materials such as silicon, carbon black, natural fibers, natural polymers, or chemical fibers made of synthetic fibers, which are called fillers, can also be used.

  Resin particles can be added directly to the puncture sealant. However, since the supply valve may be clogged if the resin particles are too large, the particle diameter of the resin particles is preferably about 0.05 to 1 mm.

  In the present invention, natural rubber latex and resin particles are used as the plugging material. This is because when the puncture sealing agent injected into the tire flows out of the puncture hole, the solid rubber latex coagulates and the resin particles are entangled. This is because the puncture hole can be tightly sealed by staying in the hole and overlapping them.

  The antifreezing agent is added for the purpose of preventing the puncture sealing agent from freezing and becoming unusable in winter. As this antifreeze, diethylene glycol is preferably used, but monoethylene glycol, propylene glycol and the like can also be used. The content of the antifreezing agent in the puncture sealing agent is preferably 5 to 60% by weight, particularly preferably 30 to 60% by weight.

  If the content of the anti-freezing agent in the puncture sealing agent is less than the above, the puncture sealing agent may freeze and become unusable in winter, and the content of the anti-freezing agent in the puncture sealing agent may be If it is more, it can be used at a temperature lower than -40 ° C. In addition, it is preferable to adjust the usage amount (content of the puncture sealant) of this antifreeze agent within the above range according to the climate of the region where the puncture sealant is used. When it is, it is preferable to set it as content of 50 weight% or more in a puncture sealing agent.

  The puncture sealing agent of the present invention may further contain a rust inhibitor such as triethanolamine, an antifoaming agent, a preservative and the like.

  As a method of puncture repair using the puncture sealing agent of the present invention as described above, a known method can be applied. That is, the valve core is removed from the valve of the punctured tire, the hose of the container filled with the puncture sealing agent is connected to the valve port, and the puncture sealing agent is injected into the tire. Thereafter, a valve core is attached, filled with air, and adjusted to a prescribed internal pressure.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to them. In the following, “%” indicating concentration and content is based on “% by weight” unless otherwise specified.

  Table 1 shows the composition content of the puncture sealing agent of the examples of the present invention. Table 1 shows materials and weight percent. The weight% amount of each component is a weight ratio amount as a solid content, and this also applies to the following tables showing the composition of the puncture sealing agent.

  The natural rubber latex used in the preparation of the puncture sealant of the above examples contains ammonia as a pH adjuster and has a rubber component of 60% by weight. Diethylene glycol is used as the antifreezing agent. The ether type nonionic surfactant is Emulgen 150 (trade name) manufactured by Kao Corporation. The preservative is Nopcoside SN-215 (trade name) manufactured by San Nopco. The EVA particles are EVA # 40 (trade name) manufactured by Sanyo Kasei Co., Ltd.

The following are two comparative puncture sealants for comparing performance with the examples of the present invention.
Comparative puncture sealant 1
A commercially available puncture sealant mainly composed of natural rubber latex and propylene glycol was used as the puncture sealant of Comparative Example 1.

Comparative puncture sealant 2
A commercially available puncture sealant mainly composed of a water-soluble polymer, propylene glycol, resin particles and fibers was used as the puncture sealant of Comparative Example 2.

  About the puncture sealing agent of Examples adjusted as described above and the comparative puncture sealants 1 and 2, in the following manner, (1) Puncture hole sealability [Puncture hole sealability (A) and Puncture hole sealability (B ) And puncture hole sealability (C)], (2) The injection workability was evaluated.

Below, the test method of puncture hole sealing property (A) (B) (C) and injection | pouring workability | operativity is demonstrated.
(1) Puncture hole sealability:
(1) -1 Puncture hole sealability (A)
As a test tire, an automotive tire 195 / 65R14 (nominal width of cross section: 195 mm, nominal ratio of flatness: 65, tire structure symbol: radial, nominal diameter of rim: 14 inches), a puncture sealant for this tire is used. The puncture hole sealability was examined using a drum tester for tire running test.

  This drum tester has a mechanism capable of realizing a state close to running by rotating the drum while pressing the tire at a position of 270 ° clockwise from the top of an iron drum having a diameter of 1707.6 mm. Then, a screw nail (a screw nail having a diameter of 4 mm is used for the test) at a position of 270 ° clockwise from the top of the drum is fixed so that the tip thereof is directed outward in the radial direction of the drum, When the tire is pressed against the nail, a puncture hole is formed in the tread at a position 90 ° from the top of the tire. Rotate the tire by hand 1/4 so that the puncture hole is 180 ° clockwise from the apex (that is, by doing so, the puncture hole is directly below) Then, remove the valve core from the valve of the punctured tire, connect the hose of the injector filled with the puncture sealing agent to the valve port, inject 450 ml of the puncture sealing agent into the tire, and then fill the tire with air The puncture sealant moves toward the puncture hole and eventually seals the puncture hole while being ejected from the puncture hole. The puncture hole sealability (A) was evaluated by the ejection time and ejection amount of the puncture sealing agent. The results are shown in Table 2.

(1) -2 Puncture sealability (B)
After filling the tire with the puncture hole sealed in the puncture hole sealability (A) test (that is, the tire where the puncture sealant injection stopped) with the internal pressure adjusted to 200 kPa, the screw nail is removed from the drum. Then, the tire is filled with air by sealing the puncture hole to the drum, and is driven for 200 km under conditions of a load of 4 km and a running speed of 100 km / hr. Immediately after stopping running, the tire internal pressure was measured, and soap water was applied to the puncture hole to check for air leaks. The results are shown in Table 2.

(1) -3 Punk sealability (C)
The puncture hole of the tire (that is, the tire that traveled 200 km under the conditions of a load of 4 km and a running speed of 100 km / Hr using a puncture sealant) in the puncture hole sealability (B) test (that is, the puncture hole) It was examined whether there was a decrease in internal pressure when left still for 1 hour. The results are shown in Table 2.

(2) Injection workability:
The puncture sealant was injected and repaired into the tire in an environment of -40 to + 70 ° C. The puncture sealant and the tire were left in the environment for 20 hours and brought to the same temperature as the environment. The injection amount of the puncture sealing agent at that time was 450 ml, and it was examined whether injection was possible. The results are shown in Table 3.

The results of the puncture hole sealability are shown below.
Table 2 shows the test nail diameter, test items (three puncture hole sealing properties (A), (B), and (C)), check items (puncture sealing agent ejection time (seconds) and ejection amount (ml), immediately after running. Inventive Example, Comparative Example 1 (Puncture Sealing Agent 1), Comparative 2 (Comparative Example 1) for tire internal pressure reduction (%) and air leakage, internal pressure reduction (%) 1 hour after running stop and air leakage) The result of the puncture hole sealing property of the puncture sealant 2) is shown.

The results of the injection workability are shown below.
Table 3 shows the results of the workability of injection of the puncture sealing agent with respect to the test temperature for the examples of the present invention, Comparative 1 (Punk Sealing Agent 1), and Comparative 2 (Punk Sealing Agent 2).

Below, the consideration which compared the Example and the performance of two comparative puncture sealants is shown.
As shown in the results of the puncture hole sealability in Table 2, the puncture hole sealability (A) with respect to the puncture holes generated by the nails having a diameter of 4 mm is short in the ejection time in the puncture sealing agents of the example and the comparative example 2. Although the ejection amount was small, the puncture sealing agent of Comparative Example 1 had a longer ejection time and a larger ejection amount than the puncture sealing agent of the example. As for the puncture hole sealing property (B), there was no difference in pressure reduction in Examples, Comparative Examples 1 and 2, and no difference. Regarding the puncture hole sealability (C), no pressure reduction was observed in the example and the comparative example 1, but a pressure reduction was observed in the comparative example 2 although it was able to travel.

  That is, the puncture sealant of the embodiment can seal against a puncture hole generated by a nail having a diameter of 4 mm, and leakage of the puncture sealant that occurs when the puncture hole is sealed (an ejection of the puncture sealant) The amount was also small. Moreover, the puncture hole sealed with the puncture sealant of the example did not leak air during and after running, and it was confirmed that the puncture sealant of the example was suitable as an emergency repair agent.

  Furthermore, it was confirmed that the puncture sealants of the examples can be used in a wide temperature range of −40 ° C. to + 70 ° C. as shown in the results of the puncture sealant injection workability in Table 3.

Claims (4)

  A puncture sealant for sealing a hole in a punctured tire, comprising a natural rubber latex, an antifreezing agent, an ether type nonionic surfactant, and resin particles.   2. The tire puncture sealing agent according to claim 1, wherein the natural rubber latex is 5 to 30% by weight.   2. The tire puncture sealant according to claim 1, wherein the ether type nonionic surfactant is 0.1 to 1% by weight.   2. The tire puncture sealant according to claim 1, wherein the resin particles are EVA (ethylene vinyl acetate), PVC (polyvinyl chloride) or powder rubber particles.