KR101773121B1

KR101773121B1 - Self-sealing tire and preparation method thereof

Info

Publication number: KR101773121B1
Application number: KR1020150170663A
Authority: KR
Inventors: 정경훈; 박정현; 김인영
Original assignee: 넥센타이어 주식회사
Priority date: 2015-12-02
Filing date: 2015-12-02
Publication date: 2017-08-30
Also published as: KR20170064776A

Abstract

Inner liner; A self-sealing tire comprising an adhesive layer formed on one side of the inner liner, wherein the adhesive layer comprises an aqueous acrylic adhesive comprising an acrylic resin and water.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a self-sealing tire and a self-

Self-sealing tire and a method of manufacturing the same.

The users' vehicles are made up of many parts, among which the tires have a substantial effect on the driving of the vehicle and can be said to be one of the key components for ensuring the safety of the user.

Tires tend to be prone to puncture or air dropping because they are easily exposed to foreign substances on the road surface, for example, nails or bone sculptures.

Particularly, when a puncture occurs on a tire due to foreign substances or other accidents present on the road during driving, it leads to a serious accident, which may pose a serious risk to the safety of the user. Further, when the punctured tire is repaired or replaced with a new tire, it takes a lot of time and cost, which may cause a lot of inconvenience to the user.

Accordingly, there has been a growing interest in self-sealing tires that can secure the safety of the user by sealing the puncture site by themselves when puncturing occurs in a tire while traveling in a car, and at the same time saving time and cost for tire replacement and repair .

A novel self-sealing tire and a method for manufacturing the same.

According to one aspect,

Inner liner;

And an adhesive layer disposed on one surface of the inner liner,

The adhesive layer is provided with a self-sealing tire including an aqueous acrylic adhesive containing an acrylic resin and water.

According to another aspect,

Preparing a tire comprising an inner liner; And

Providing an aqueous acrylic adhesive comprising an acrylic resin and water on one side of the inner liner;

A method of manufacturing a self-sealing tire is provided.

The self-sealing tire can self-seal the puncture generated during driving to secure the safety of the user, and the sound absorbing material can be used together to obtain a self-sealing and sound absorption effect. Since the weight of the entire tire is small, It can also be improved.

The self-sealing tire manufacturing method is an eco-friendly process, which can prevent the risk of environmental pollution and simplify the process, thereby reducing the production cost and time of the tire.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic illustration of the structure of a self-sealing tire according to one embodiment.
Fig. 2 is a view schematically showing the structure of a self-sealing tire according to another embodiment. Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention and methods of achieving them will be apparent with reference to the embodiments described in detail below with reference to the drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or corresponding components throughout the drawings, and a duplicate description thereof will be omitted .

In the following embodiments, the terms first, second, and the like are used for the purpose of distinguishing one element from another element, not the limitative meaning.

In the following examples, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

In the following embodiments, terms such as inclusive or possessive are intended to mean that a feature, or element, described in the specification is present, and does not preclude the possibility that one or more other features or elements may be added.

In the drawings, components may be exaggerated or reduced in size for convenience of explanation. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to those shown in the drawings.

If certain embodiments are otherwise feasible, the particular process sequence may be performed differently from the sequence described. For example, two processes that are described in succession may be performed substantially concurrently, and may be performed in the reverse order of the order described.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic illustration of the structure of a self-sealing tire according to one embodiment.

Referring to FIG. 1, a self-sealing tire 10 according to one embodiment includes a tread portion 100, a sidewall portion 200, and a bead portion 300.

The tread portion 100 is a portion in contact with the ground surface in a sectional view, and serves to protect the tire from impacts and trauma from a road surface or the like. A plurality of blocks partitioned by grooves may be formed on the surface of the tread portion in order to drain the tire.

The sidewall 200 and the bead 300 are sequentially positioned on both sides of the tread portion along the width direction of the tire.

The sidewall 200 is a portion extending from both ends of the tread to form a side surface of the tire. The sidewall 200 abuts against the carcass layer 400 located on the inner side, withstanding repeated shrinkage and expansion during traveling. It plays a role.

The bead portion 300 is provided at both ends of the sidewall 200 to surround the end portion of the cord and the bead portion 300 includes a bead core 500 including a ring-shaped steel wire.

A carcass layer 400 is positioned between the pair of right and left bead parts 300 and is joined to a tire rubber sheet inside the tire to form a skeleton of the tire. The carcass layer 400 is bonded to the bead core 500 ) From the inside of the tire to the outside.

An inner liner 700 is disposed on one side of the carcass layer 400 to prevent the air inside the tire from escaping outward.

The belt layer 600 may be positioned on the outer surface of the carcass layer 400 located in the tread portion 100 as a reinforcing layer that enhances the elasticity of the tread and provides steering and stability.

In the self-sealing tire according to an embodiment, both the material and the shape of known members can be used as the constituent parts of the tire, that is, the tread part, the bead part, the carcass layer, the inner liner and the belt layer.

An adhesive layer 800 is disposed inside the inner liner 700 at a position corresponding to the position of the tread portion 100.

The adhesive layer 800 includes an aqueous acrylic adhesive containing an acrylic resin and water.

The aqueous acrylic adhesive may have a glass transition temperature of -50 캜 to -10 캜. For example, the aqueous acrylic adhesive may have a glass transition temperature of -45 캜 to -15 캜. For example, the aqueous acrylic adhesive may have a glass transition temperature of -30 캜 to -20 캜. If the glass transition temperature of the aqueous acrylic adhesive is less than -50 ° C, the fluidity of the adhesive can be maintained even when exposed to a low temperature environment, and the self-sealing performance can be exerted irrespective of external temperature conditions, When the glass transition temperature of the aqueous acrylic adhesive exceeds -10 캜, the self-sealing effect can not be sufficiently exhibited.

The aqueous acrylic adhesive may have a viscosity of 9,000 to 15,000 cps measured at 25 ° C by means of a Brookfield viscometer. For example, the aqueous acrylic adhesive may have a viscosity of 10,000 to 13,000 cps at 25 캜. According to one embodiment, the aqueous acrylic adhesive may have a viscosity of 11,000 to 12,000 cps at 25 ° C. If the viscosity of the aqueous acrylic adhesive is less than 9,000 cps, it is difficult to realize the performance as an adhesive due to the excessively high fluidity of the adhesive. If the viscosity of the aqueous acrylic adhesive exceeds 15,000 cps, the fluidity of the adhesive is too low, .

The acrylic resin may include a copolymer of a (meth) acrylic acid alkyl ester monomer and a vinyl monomer having a carboxyl group. For example, the acrylic resin may include a polymer obtained by emulsion-polymerizing a (meth) acrylic acid alkyl ester monomer and a vinyl monomer having a carboxyl group.

The (meth) acrylic acid alkyl ester monomer serves to impart adhesiveness, moisture resistance and heat resistance to the aqueous acrylic pressure-sensitive adhesive.

The (meth) acrylic acid alkyl ester monomer may be selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) Acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, nonyl (meth) acrylate, cyclohexyl (meth) acrylate or combinations thereof.

The vinyl monomer having a carboxyl group serves to impart water dispersion stability to the aqueous acrylic pressure-sensitive adhesive.

The vinyl monomer having a carboxyl group may be at least one selected from the group consisting of (meth) acrylic acid, -carboxyethyl (meth) acrylate, 2- (meth) acryloylpropionic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid, , Or a combination thereof.

The weight ratio of the (meth) acrylic acid alkyl ester monomer to the vinyl monomer having a carboxyl group may be from 200: 1 to 10: 1. For example, the weight ratio of the (meth) acrylic acid alkyl ester monomer to the carboxyl group-containing vinyl monomer may be 100: 1 to 20: 1. When the weight ratio of the (meth) acrylic acid alkyl ester monomer to the vinyl monomer having the carboxyl group is within the above range, an adhesive excellent in adhesiveness and water resistance can be obtained when the adhesive is produced using the acrylic resin.

The acrylic resin can be produced by emulsion-polymerizing a (meth) acrylic acid alkyl ester monomer and a vinyl monomer having a carboxyl group. For example, the acrylic resin may be prepared by reacting a mixture containing the alkyl (meth) acrylate ester and a vinyl monomer having a carboxyl group at a temperature of 0 to 80 ° C. for 3 to 10 hours to emulsion-polymerize the monomers .

The mixture comprising the (meth) acrylic acid alkyl ester monomer and the vinyl monomer having a carboxyl group may further include a polymerization initiator, a chain transfer agent, or a combination thereof.

Examples of the polymerization initiator include persulfates such as ammonium sulfate, sodium persulfate and potassium persulfate; Hydrogen peroxide; Azo compounds such as azobis-2-methylpropionamidine hydrochloride and azoisobutyronitrile; Peroxides such as benzoyl peroxide, lauroyl peroxide, cumene hydroperoxide, t-amyl peroxy-2-ethylhexanoate, and the like, and mixtures thereof.

The content of the polymerization initiator may vary depending on the reaction temperature and type, but may be 0.01 to 5 parts by weight based on 100 parts by weight of the mixture comprising the alkyl (meth) acrylate and the vinyl monomer having a carboxyl group. For example, the content of the polymerization initiator may be 0.05 to 3 parts by weight based on 100 parts by weight of the mixture comprising the (meth) acrylic acid alkyl ester monomer and the carboxyl group-containing vinyl monomer.

The chain transfer agent may be selected from, for example, mercaptoethanol, thioglycerol, thioglycolic acid, mercaptopropionic acid, 2-mercaptopropionic acid, 3-mercaptopropionic acid, octyl thioglycolate, octyl 3-mercaptopropionate, 2- Thiol chain transfer agents such as mercaptoethanesulfonic acid, n-dodecyl mercaptan, octyl mercaptan, and butyl thioglycolate; Halides such as carbon tetrachloride, carbon tetrabromide, methylene chloride, bromoform and bromotrichloroethane; unsaturated hydrocarbon compounds such as? -methylstyrene dimer,? -terpinene, dipentene, and terpinolene; Primary alcohols such as 2-aminopropane-1-ol; Secondary alcohols such as isopropanol; Phosphorous acid, hypophosphorous acid and its salts; Sulfurous acid, hydrogen sulfite, dithionite, meta-sulfite and salts thereof; And mixtures thereof.

The content of the chain transfer agent may be 0.001 to 5 parts by weight based on 100 parts by weight of the mixture comprising the (meth) acrylic acid alkyl ester and the carboxyl group-containing vinyl monomer. For example, the content of the chain transfer agent may be 0.01 to 3 parts by weight based on 100 parts by weight of the mixture comprising the (meth) acrylic acid alkyl ester monomer and the carboxyl group-containing vinyl monomer.

The content of water in the aqueous acrylic adhesive may be 10 to 60 parts by weight based on 100 parts by weight of the acrylic resin. For example, the content of water in the aqueous acrylic adhesive may be 20 to 58 parts by weight based on 100 parts by weight of the acrylic resin. According to one embodiment, the content of water in the aqueous acrylic adhesive may be 30 to 55 parts by weight based on 100 parts by weight of the acrylic resin. The content of the water may vary depending on processing conditions to be described later, and it is possible to control the viscosity of the aqueous acrylic adhesive by controlling the water content. If the amount of the water is less than 10 parts by weight based on 100 parts by weight of the acrylic resin, the adhesive is too low in fluidity to be applied by spray or brush, and the content of water is more than 60 parts by weight , The fluidity of the adhesive is excessively large and it is difficult to realize the performance as an adhesive.

The solid content of the aqueous acrylic adhesive may be from about 50 to about 70 weight percent. For example, the solids content of the aqueous acrylic adhesive may range from about 62 to about 64 wt%.

The pH of the aqueous acrylic adhesive may be about 2.0 to about 4.0, and the flash point may be 100 ° C or more.

The above water-based acrylic adhesive uses acrylic resin as a main component and water as a solvent. When the aqueous acrylic adhesive is applied to a specific site and then heat is applied, a part of the water in the adhesive is evaporated and the acrylic resin of the adhesive forms a self-crosslinking. As a result, the adhesive has an adhesive force to a specific region. Since the aqueous acrylic adhesive uses water as a solvent, it is eco-friendly, and at the same time, the adhesive strength is excellent and an excellent sealing effect can be exhibited even with a small application amount. Further, since the viscosity of the aqueous acrylic adhesive can be controlled according to the content of water, an adhesive having an appropriate viscosity may be used according to processing conditions. In addition, the aqueous acrylic adhesive has an excellent adhesive strength, so that a later-described ash-containing material can be easily attached to the self-sealing tire, thereby effectively realizing the self-sealing property and sound absorption property of the tire.

The thickness of the adhesive layer may be 1 to 5 mm. For example, the thickness of the adhesive layer may be 1.5 to 4.5 mm. If the thickness of the adhesive layer is less than 1 mm, the self-sealing effect can not be sufficiently exhibited. If the thickness exceeds 5 mm, the total weight of the tire increases, resulting in poor rolling resistance of the tire.

The aqueous acrylic adhesive may further include a surfactant in addition to the acrylic resin and water.

The surfactant is used for the initial particle generation, the size control of the generated particles and the stability of the particles during the emulsion polymerization. The surfactant is composed of a hydrophilic group and a lipophilic group, and is divided into anionic, cationic and nonionic surfactant . It is mainly used anionic and nonionic surfactants, and they are mixed with each other to supplement mechanical stability and chemical stability.

The anionic surfactant may be selected from the group consisting of sodium lauryl sulfate, potassium lauryl sulfate, ammonium lauryl sulfate, sodium myristyl sulfate, sodium cetyl sulfate, At least one member selected from the group consisting of Sodium Cetyl Sulfate, Sodium Cocoyl Glutamate, Sodium Laureth Sulfate and Ammonium Laureth Sulfate.

The nonionic surfactant may be selected from the group consisting of coco glucoside, POE lanolin alcohol, POE lauryl ether, POE Cetyl ether, polyoxyethylene stearyl ether (polyoxyethylene lauryl ether) POE Strearyl Ether, POE Oleyl Ether, and POE Behenyl Ether. The polyolefin resin may be at least one selected from the group consisting of POE stearyl ether, polyoxyethylene oleyl ether and POE behenyl ether.

The content of the surfactant may be 0.1 to 5 parts by weight based on 100 parts by weight of the mixture comprising the (meth) acrylic acid alkyl ester and the carboxyl group-containing vinyl monomer.

The aqueous acrylic adhesive can be prepared by preparing a mixture containing an acrylic resin and a surfactant at a temperature of 70 ° C to 80 ° C by using a known stirring device, and then adding water to the mixture.

The stirring device may be, for example, a mechanical stirrer, a double helix mixer, a high-speed emulsifier, a homogenizer, a high shear blender or an ultrasonic homogenizer, But are not limited to:

Since the self-sealing tire includes an adhesive layer containing an aqueous acrylic adhesive, even if the tread portion is damaged by a foreign substance such as nails, the damaged portion can be sealed by itself due to the viscosity of the adhesive layer, .

Fig. 2 is a view schematically showing the structure of a self-sealing tire according to another embodiment. Fig.

2, a self-sealing tire 10 according to one embodiment includes a tread portion 100, a side wall portion 200, a bead portion 300, a carcass layer 400, a bead core 500, A layer 600, an inner liner 700, and an adhesive layer 800. The thicknesses of the tread portion 100, the side wall portion 200, the bead portion 300, the carcass layer 400, the bead core 500, the belt layer 600, the inner liner 700, The description refers to what is described herein.

A sound absorbing material 900 is disposed on the adhesive layer 800 disposed on the inner side of the inner liner 700.

The sound absorbing material 900 serves to reduce or suppress the generation of the reflected wave noise by absorbing the standing wave sound resonated in the groove in the sound absorbing material. Since the adhesive layer 800 has a self-sealing function and has an excellent adhesive force, the sound-absorbing material 900 can be easily adhered to the adhesive layer 800, so that the self-sealing tire has a self- It can be demonstrated at the same time.

The sound absorbing material 900 may be formed of a material such as polyurethane foam, polyurea foam, polyvinyl chloride foam, polypropylene foam, polyethylene foam, polystyrene foam, polyvinyl acetate foam, melamine foam, phenol foam, And may be at least one selected from the group consisting of foam, foam, non-woven fabric, textile fabric, glass wool, mineral wool, and rock.

The plurality of sound absorbing materials 900 may be disposed on the adhesive layer 800 at regular intervals. Further, a sound absorbing material may be disposed on the adhesive layer 900 so as to cover the entire surface of the adhesive layer 800.

The thickness of the sound absorbing material 900 is not particularly limited and may vary depending on the height of the sidewall portion of the tire or the degree of desired sound absorption performance. According to one embodiment, the thickness of the sound absorbing material 900 may be 10 to 60 mm. For example, the thickness of the sound absorbing material 900 may be 30 to 50 mm.

Hereinafter, a method of manufacturing a self-sealing tire according to one embodiment will be described.

The method of manufacturing the self-sealing tire includes: preparing a tire including an inner liner; And providing an aqueous acrylic adhesive comprising an acrylic resin and water on one surface of the inner liner.

The tire including the inner liner may further include a tread portion, a side wall portion, a bead portion, a carcass layer, a bead core, and a belt layer. The description of the tread portion, the side wall portion, the bead portion, the carcass layer, the bead core, the belt layer and the inner liner is described herein.

The respective constituent parts of the tire, that is, the tread part, the sidewall part, the bead part, the carcass layer, the bead core, the belt layer and the inner liner can be manufactured by known methods.

The step of providing the aqueous acrylic adhesive may include the step of applying the aqueous acrylic adhesive on one side of the inner liner and the step of forming an adhesive layer by applying heat to the aqueous acrylic adhesive.

A description of the aqueous acrylic adhesive is given in this specification.

The step of applying the aqueous acrylic adhesive may be carried out using a spray or a brush. Since the viscosity of the aqueous acrylic adhesive can be controlled according to the content of water, an adhesive having an appropriate viscosity may be used depending on the application method. In addition, the step of applying the aqueous acrylic adhesive may be carried out by a known coating method such as dip coating, flow coating, roll coating, spin coating or gravure coating.

The step of applying heat to the aqueous acrylic adhesive may be carried out at a temperature of 25 ° C to 80 ° C for 10 minutes to 24 hours. The step of applying heat to the aqueous acrylic adhesive may be performed by leaving it at room temperature for 24 hours, but in order to rapidly evaporate the water in the adhesive and reduce the processing time, the aqueous acrylic adhesive is heated in the chamber at a temperature of 60 to 80 ° C For 10 minutes to 20 minutes.

Since the manufacturing method of the self-sealing tire uses an environmentally friendly aqueous acrylic adhesive, the risk of environmental pollution can be prevented, and the manufacturing process can be simplified, thereby reducing the production cost and time of the tire.

The step of providing the aqueous acrylic adhesive may further include providing a sound absorbing material on the adhesive layer.

For a description of the sound absorbing material, refer to what is described in this specification.

The step of providing the sound absorbing material on the adhesive layer may include the step of attaching the sound absorbing material on the adhesive layer.

The step of providing the aqueous acrylic adhesive may include: preparing a sound absorbing material; Providing the aqueous acrylic adhesive on the sound absorbing material; And providing the sound absorbing material on one surface of the inner liner such that the aqueous acrylic adhesive is disposed between one surface of the inner liner and the sound absorbing material.

The step of providing the aqueous acrylic adhesive may include applying the aqueous acrylic adhesive on the sound absorbing material and drying the aqueous acrylic adhesive to form an adhesive layer.

When the sound absorbing material is attached on one surface of the inner liner so that the adhesive layer is formed by applying the aqueous acrylic adhesive on the sound absorbing material and the adhesive layer is disposed between one surface of the inner liner and the sound absorbing material, It is not necessary to use a primer to be used for attaching the sound absorbing material to the light source. Accordingly, the weight of the tire as a whole can be reduced to improve the fuel efficiency of the automobile, and the risk of environmental pollution that may be caused by the primer including the toluene-based solvent can be prevented.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art . Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Example

Example 1

(Production of acrylic resin)

45 parts by weight of 2-ethylhexyl acrylate, 45 parts by weight of butyl acrylate, 5 parts by weight of methyl methacrylate, 5 parts by weight of acrylic acid and 1 part by weight of t-amyl peroxy-2-ethylhexanoate were added to a stirrer , And stirred to prepare an emulsion. The emulsion was stirred at 60 占 폚 under a nitrogen atmosphere for 3 hours. Subsequently, the emulsion was cooled to 25 DEG C and then filtered through a 200-mesh fibril to obtain an acrylic resin.

(Preparation of aqueous acrylic adhesive)

100 parts by weight of the acrylic resin and 1.5 parts by weight of sodium lauryl sulfate were added to a stirrer. 55 parts by weight of water was added to the mixture and stirred at 70 캜 to prepare an aqueous acrylic adhesive.

(Production of tire)

The aqueous acrylic adhesive was applied on one surface of an inner liner of a tire (Nexen Tire Co., Ltd., CP671) to a thickness of 1 mm using a spray. The tire was placed in a chamber and heated at a temperature of about 60 DEG C for about 30 minutes to form an adhesive layer. As a result, a tire was produced.

Example 2

A tire was produced in the same manner as in Example 1, except that an aqueous acrylic adhesive was applied on one surface of the inner liner of the tire to a thickness of 3 mm.

Example 3

A tire was manufactured in the same manner as in Example 1, except that an aqueous acrylic adhesive was applied on one side of the inner liner of the tire to a thickness of 5 mm.

Comparative Example 1

A tire was produced in the same manner as in Example 2, except that a butyl rubber-based adhesive (manufactured by FINEXX Co., Ltd.) was used instead of the aqueous acrylic adhesive.

Comparative Example 2

A tire was produced in the same manner as in Example 2, except that a butyl rubber-based adhesive (manufactured by KeyLin Co., Ltd.) was used in place of the aqueous acrylic adhesive.

Example 4

(Production of a tire with a sound absorbing material attached thereto)

One polyurethane foam foam (SERRIM TITY SEY, SEW-1BL) having a size of 2000 mm x 180 mm and a thickness of 30 mm was prepared, and the aqueous acrylic adhesive prepared in Example 1 was sprayed on each of the polyurethane foam foam To a thickness of 2 mm. Then, the polyurethane foam foam was manually attached on the adhesive layer of the tire produced in Example 1 so that the polyurethane foam foam covered the entire one surface of the inner liner of the tire. As a result, a tire with a sound absorbing material attached thereto was produced.

Example 5

(Production of a tire with a sound absorbing material attached thereto)

Four polyurethane foamed foams (SERRIM TITY SEY, SEW-1BL) having a size of 165 mm x 50 mm and a thickness of 50 mm were prepared, and the aqueous acrylic adhesive prepared in Example 1 was sprayed on each of the polyurethane foamed foams To a thickness of 3 mm. The foamed foam coated with the aqueous acrylic adhesive was placed in a chamber and heated at a temperature of about 80 캜 for about 10 minutes to form an adhesive layer. 90 °, 180 °, and 270 ° on one side of the inner liner of the tire so that the adhesive layer is disposed between one side of the inner liner of the tire (Nexen Tire Co., Ltd., CP671) and the polyurethane foam foam Standard), the four sound absorbing materials were attached by hand. As a result, a tire with a sound absorbing material attached thereto was produced.

Evaluation Example 1: Evaluation of durability

The durability of the tires made in Examples 1 to 3 and the tires made in Comparative Examples 1 and 2 were evaluated according to the following procedure:

Eight nails 2.9 mm in diameter were placed in the tread portion of the tire. Of the eight 2.9 mm diameter nails embedded in the tread portion of the tire, four were pulled out and four were stuck. Subsequently, eight nails having a diameter of 3.7 mm were placed in the tread portion of the tire. Of the eight 3.7 mm diameter nails studded in the tread portion of the tire, four were pulled out and four were stuck. Subsequently, eight nails having a diameter of 4.6 mm were placed in the tread portion of the tire. Of the eight 4.6 mm diameter nails embedded in the tread portion of the tire, four were pulled out and four were stuck. The tire was mounted on an indoor running tester (manufactured by Daekyung Co., Ltd., product name: high-speed durability tester) and traveled at a speed of 90 km / h at a distance of 16,000 km.

After completion of the run, eight portions of nail-studded or studded 2.9 mm diameter, eight portions studded or studded 3.7 mm in diameter, and eight portions studded or studded 4.6 mm in diameter were sprayed with soapy water And the presence of gas in each part was observed. The number of gas-evolving portions of the eight portions of the 2.9 mm diameter nailed or buried, the number of gas-generating portions of the eight nailed or buried nail portions of 3.7 mm in diameter, and the nail of 4.7 mm in diameter And the number of the gas-generating portions among the eight portions in which the gasket was stuck or embedded.

The above procedure was repeated one more time. Then, total sealing efficiency (E _t ) was calculated according to the following equation (1). The results are shown in Table 1 below.

&Quot; (1) "

Total sealing efficiency (E _t ) (%) = (E ₂ _.9 ) × 50 + (E ₃ _.7 ) × 25 + (E ₄ _.6 ) × 15

* E _2.9 = Number of parts of gas in the eight parts that were nailed or buried 2.9 mm in diameter after completion of driving × 8

* E _3.7 = Number of areas where gas is generated among eight parts of nailed or buried 3.7 mm diameter after completion of travel × 8

* E _4.6 = Number of areas where gas is generated among eight areas of nailed or buried 4.6 mm in diameter after completion of travel × 8

Adhesive layer thickness Total sealing efficiency (%) Average Total Sealing Efficiency (%) After one trip After 2 trips Example 1 1 mm 86.3 82.3 83.4 Example 2 3 mm 88.3 84.3 85.4 Example 3 5 mm 85.4 84.4 84.5 Comparative Example 1 3 mm 0 0 0 Comparative Example 2 3 mm 73.1 78.1 75.6

From the above Table 1, it can be confirmed that the tires of Examples 1 to 3 have higher total sealing efficiency than the tires of Comparative Example 2, and thus are excellent in self-sealing performance. In the tire of Comparative Example 1, after completion of running, the adhesive layer, which had been formed on one side of the inner lighter, melted down and had eight portions of a diameter of 2.9 mm nailed or studded, eight portions of nail- And a gas of 4.8 mm in diameter was produced in all of the eight parts that were nailed or stuck.

Evaluation Example 2: Evaluation of sound absorption characteristics

Resonance tones (60 kph), rumble noise (60 kph) and pattern noise (80 kph) of the tires produced in Examples 2 and 4 were measured respectively using LMS-scadas mobile scm02 (Siemens). The results are shown in Table 2 below.

Noise level (dB) Example 2 Example 4 Example 5 Resonance sound (60 kph) 68.3 60.8 60.3 Rumble Noise (60kph) 63.1 61.2 59.2 Pattern noise (80kph) 55.2 54.5 54.2

From Table 4, it can be confirmed that the tires of Examples 4 and 5 are superior in sound absorption characteristics to those of Example 2.

10: Self-sealing tire
100: Tread portion
200: side wall part
300: bead portion
400: Carcass layer
500: bead core
600: Belt layer
700: Inner Liner
800: adhesive layer
900: Sound absorbing material

Claims

Inner liner;
And an adhesive layer disposed on one surface of the inner liner,
Wherein the adhesive layer comprises an aqueous acrylic adhesive containing an acrylic resin and water,
Wherein said aqueous acrylic adhesive has a glass transition temperature of -50 占 폚 to -10 占 폚 and a viscosity at 25 占 폚 of 9,000 to 15,000 cps.

delete

The method according to claim 1,
Wherein the acrylic resin includes a copolymer of a (meth) acrylic acid alkyl ester monomer and a vinyl monomer having a carboxyl group.

The method of claim 3,
The (meth) acrylic acid alkyl ester monomer may be selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, tert- ) Self-sealing tire comprising 2-ethylhexyl acrylate, octyl (meth) acrylate, nonyl (meth) acrylate, cyclohexyl (meth) acrylate or a combination thereof.

The method of claim 3,
The vinyl monomer having a carboxyl group may be at least one selected from the group consisting of (meth) acrylic acid, (meth) acrylic acid? -Carboxyethyl, 2- (meth) acryloylpropionic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid, Or combinations thereof.

The method according to claim 1,
Wherein the water content is 10 to 60 parts by weight based on 100 parts by weight of the acrylic resin.

The method according to claim 1,
Wherein the aqueous acrylic adhesive further comprises a surfactant.

The method according to claim 1,
And a sound absorbing material disposed on the adhesive layer.

9. The method of claim 8,
The sound absorbing material may be at least one selected from the group consisting of polyurethane foam, polyurea foam, polyvinyl chloride foam, polypropylene foam, polyethylene foam, polystyrene foam, polyvinyl acetate foam, melamine foam, phenol foam, Woven fabric, textile fabric, glass wool, mineral wool, and lacquer.

Preparing a tire comprising an inner liner; And
Providing an aqueous acrylic adhesive comprising an acrylic resin and water on one surface of the inner liner,
Wherein the aqueous acrylic adhesive has a glass transition temperature of -50 占 폚 to -10 占 폚 and a viscosity at 25 占 폚 of 9,000 to 15,000 cps.

11. The method of claim 10,
The step of providing the aqueous acrylic adhesive may include applying the aqueous acrylic adhesive on one side of the inner liner; And forming an adhesive layer by applying heat to the aqueous acrylic adhesive.

12. The method of claim 11,
Wherein the step of applying the aqueous acrylic adhesive is performed using a spray or a brush.

12. The method of claim 11,
Wherein the step of applying heat to the aqueous acrylic adhesive is carried out at a temperature of 25 DEG C to 80 DEG C for 10 minutes to 24 hours.

12. The method of claim 11,
Further comprising the step of providing a sound absorbing material on the adhesive layer.

12. The method of claim 11,
The step of providing the aqueous acrylic adhesive
Preparing a sound absorbing material;
Providing the aqueous acrylic adhesive on the sound absorbing material; And
Providing the sound absorbing material on one surface of the inner liner such that the aqueous acrylic adhesive is disposed between one surface of the inner liner and the sound absorbing material;
Further comprising the steps of:

16. The method of claim 15,
Wherein the step of providing the aqueous acrylic adhesive comprises applying the aqueous acrylic adhesive onto the sound absorbing material and applying an adhesive to the aqueous acrylic adhesive to form an adhesive layer.