KR20210105228A - Tire - Google Patents

Abstract

The present invention relates to a tire mounted on a vehicle, comprising: a tread unit including at least an area in contact with the road surface when the vehicle is driven; a body ply disposed on the inside of the tread unit; and a cap ply disposed between the body ply and the tread unit. The cap ply includes a plurality of first cords and a first compound formed on the first cords. The body ply includes a plurality of second cords and a second compound formed on the second cords. The first compound and the second compound may include a rubber composition including SiO2. The present invention relates to the tire with improved durability performance of the tire by improving adhesion between the cord and the compound even in a high-temperature and a high-humidity environment formed during tire driving.

Description

tire

Various embodiments of the present invention relate to a tire, and more particularly, to a tire capable of improving adhesion between a cord and a compound even in a high-temperature and high-humidity environment formed while the tire is running.

A vehicle driven by users is composed of many parts, and among them, a tire substantially affects the driving of the vehicle, and in particular, it can be said to be one of the key parts for securing the safety of the user.

In particular, due to the development of the industry, the movement of logistics increases, the amount of movement due to an increase in the amount of personal work, etc., and the amount of automobile operation due to an increase in family life are increasing.

Meanwhile, among the components constituting the tire, a cap ply and a body ply may support a load received by the tire and absorb a road impact. The cap ply and body ply are composed of a cord and a compound topping the cord, but there is a problem that aging and deterioration of the adhesive layer between the cord and the compound occurs due to heat and moisture generated during tire driving. . Specifically, nylon, which is a material used as a cord for cap ply _{, includes a reactor -R'CONH 2 , which reacts with H 2} O generated by the external environment to generate -R'COOH and NH ₃ The decomposition reaction proceeds. At this time, the generated NH ₃ reacts with -R'COOR”, which is a reactor of PET used as the code of the body fly, and an amine decomposition reaction to generate _{-R'CONH 2 and -R”-OH proceeds.} In other words, hydrolysis and amine decomposition continuously chain reaction, exposing the cord to the outside and reducing the adhesion between the cord and the compound, which can cause a major problem in terms of durability of the tire while driving.

The present invention relates to a tire for improving adhesion between a cord and a compound even in a high-temperature and high-humidity environment formed during tire driving to solve the above problems.

The present invention relates to a tire mounted on a vehicle, comprising: a tread portion including at least an area in contact with a road surface when the vehicle is driven; a body ply disposed on the inside of the tread; and a cap ply disposed between the body ply and the tread portion, wherein the cap ply includes a plurality of first cords and a first compound formed on the first cord, and the body ply includes a plurality of second cords. A cord and a second compound formed on the second cord may be included, and the first compound and the second compound may include a rubber composition including _{SiO 2 .}

In the present invention, since the compound of the cap ply and the body ply _{contains SiO 2} , moisture generated during the driving of the tire is removed, thereby preventing deterioration in adhesive strength. Prior to hydrolysis and amine decomposition of the cord, SiO _{2 present in the compound and H 2} O generated from the outside react in advance, thereby suppressing the destruction of the cord and the adhesive layer, and maintaining the adhesion between the cord and the compound. That is, _{through the composition of the compound including SiO 2} , adhesive strength can be maintained even in high temperature and humid environments, and durability performance of the tire can be improved.

1 is a schematic front view of a tire according to an embodiment of the present invention.
FIG. 2 is a partial perspective view viewed from the direction A of FIG. 1 .
3 is a cross-sectional view taken along line III-III of FIGS. 1 and 2 .
FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3 .
5 is an enlarged view illustrating an enlarged view of B of FIG. 4 .
6 is an enlarged view showing an enlarged view of C of FIG. 4 .

Hereinafter, various embodiments of the present document will be described with reference to the accompanying drawings. The examples and terms used therein are not intended to limit the technology described in this document to specific embodiments, and should be understood to include various modifications, equivalents, and/or substitutions of the embodiments.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, and when described with reference to the drawings, the same or corresponding components are given the same reference numerals, and the overlapping description thereof will be omitted. .

In the following embodiments, terms such as first, second, etc. are used for the purpose of distinguishing one component from another, not in a limiting sense.

In the following examples, the singular expression includes the plural expression unless the context clearly dictates otherwise.

In the following embodiments, terms such as include or have means that the features or components described in the specification are present, and the possibility that one or more other features or components may be added is not excluded in advance.

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

In the following embodiments, the x-axis, the y-axis, and the z-axis are not limited to three axes on a Cartesian coordinate system, and may be interpreted in a broad sense including them. For example, the x-axis, y-axis, and z-axis may be orthogonal to each other, but may refer to different directions that are not orthogonal to each other.

Where certain embodiments are otherwise feasible, a specific process sequence may be performed different from the described sequence. For example, two processes described in succession may be performed substantially simultaneously, or may be performed in an order opposite to the order described.

1 is a front view schematically showing a tire according to an embodiment of the present invention, FIG. 2 is a partial perspective view viewed from the direction A of FIG. 1, and FIG. 3 is a cut-off taken along line III-III of FIGS. It is a cross-sectional view, and FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3 .

1 to 4 , the tire 100 of this embodiment may include a tread 110 , a sidewall 180 , a body ply 130 , and a cap ply 120 .

Referring to FIG. 1 , the tire 100 may have a shape extending in the circumferential direction RT about the central axis AX. In addition, a wheel (not shown) may be coupled to the inner side of the tire 100 in the radial direction r from the central axis AX.

The tread unit 110 may include a region facing the road surface when the tire 100 is mounted on the vehicle and then driven. For example, the tread unit 110 may include a region in contact with the road surface when the vehicle is driven.

The tread 110 may have one or more patterns, and a plurality of grooves 115 may be formed adjacent to these patterns. The groove 115 may have a shape that is elongated in at least the first direction. In addition, the groove 115 may also include a region having a shape that is elongated in a direction crossing the first direction.

The number and shape of the grooves 115 may be variously determined according to the driving characteristics and use of the tire 100 .

The sidewall 180 is connected to the tread 110 . A bead unit 140 for stably coupling the tire 100 to a wheel (not shown) may be disposed in an area of the sidewall 180 in a direction opposite to the area connected to the tread unit 110 .

The bead part 140 may have various shapes, and for example, may have an area in the form of a wire bundle of a square or hexagonal shape coated with rubber on a steel wire, and through this, the tire 100 is rimmed. (Rim) can be seated and fixed. In addition, the bead portion 140 may have a buffer region for distributing the load on the wire bundle-shaped region and alleviating external impact.

The body ply 130 constitutes the main skeleton of the tire 100 , and may support the load received by the tire 100 and absorb the impact of the road surface. The body ply 130 may include a cord form. A detailed description of the body ply 130 will be described later with reference to FIG. 4 or less.

In an optional embodiment, an inner liner 160 may be further disposed inside the body ply 130 . The inner liner 160 may be disposed on the innermost side of the tire 100 to reduce or prevent air leakage.

The cap ply 120 may be disposed between the body ply 130 and the tread unit 110 . The cap ply 120 may include a cord form. A detailed description of the cap ply 120 will be described later with reference to FIG. 4 or less.

As an optional embodiment, the belt layer 170 may be further disposed between the cap ply 120 and the body ply 130 . The belt layer 170 alleviates the shock received by the tire 100 from the road surface when the vehicle equipped with the tire 100 is driven and expands the tread surface of the tread unit 110 to improve the grounding characteristics and driving stability. .

The belt layer 170 may be formed in various forms, for example, may be formed of a plurality of layers.

Hereinafter, with reference to FIGS. 4 to 6 , the cap ply 120 and the body ply 130 will be described in detail.

FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3 . 5 is an enlarged view illustrating an enlarged view of B of FIG. 4 . 6 is an enlarged view showing an enlarged view of C of FIG. 4 .

4 and 5 , the cap ply 120 may include a plurality of first cords 123 , a first adhesive layer 122 , and a first compound 121 .

The plurality of first cords 123 included in the cap ply 120 may include nylon.

The first adhesive layer 122 may be adhered to the surface of the first cord 123 . The first adhesive layer 122 may include resorcinol-formalin-latex (RFL). RFL has many -OH reactive groups, so that adhesion with the first compound 121 is generated.

The first compound 121 may be formed by topping the rubber composition on the first cord 123 on which the first adhesive layer 122 is formed. The first compound 121 may include a rubber composition. Specifically, the first compound 121 may include a rubber composition including _{SiO 2 .} The first compound 121 may include a polymer, a filler, an additive, and SiO ₂ .

Polymers include natural rubber, fluororubber, silicone rubber, latex, nylon, butyl rubber, halobutyl rubber, polyisobutene, NBR (acrylonitrile-butadiene rubber), EPDM (ethylene propylene diene rubber), ACM (acrylic rubber) , AEM (ethylene-acrylic rubber), SBR (styrene-butadiene rubber), EPR (ethylene-propylene copolymer), BR (butadiene rubber), CR (chloroprene rubber), CSM (chlorosulfonated polyethylene rubber), ECO ( Epichlorohydrin rubber), PET (Polyethylene terephthalate), PEN (Polyethylene naphthalate), PC (Poly Carbonate), PVC (Poly Vinylchloride), PA (Polyamide), PPS (Polyphenylene Sulfide), PK (Polyketone), EVOH (Ethylene) Vinyl Alcohol), PTFE (Polytetrafluoroethylene), phenolic resin, isocyanate compound, polyolefin, polyurethane, polychloroprene, polypropylene, polystyrene, polyester-based polymer, polyethylene-based polymer, and at least one selected from the group consisting of a thermoplastic elastomer may include.

The filler may be a carbon black-based filler.

Additives may include plasticizers, work aids, antioxidants or antioxidants, and the like.

SiO ₂ may be included in the form of silica particles or silica gel.

Here, the first compound 121 may include 30 to 50 parts by weight of the filler, 20 to 40 parts by weight of the additive, and 2 to 8 parts by _{weight of SiO 2 based on 100 parts by weight of the polymer.} When SiO ₂ is included in an amount of less than 2 parts by weight, the effect of removing moisture and improving the adhesion may be reduced. When SiO ₂ is included in excess of 8 parts by weight, the physical properties of the first compound 121 may vary. In the present invention, _{by including 2 to 8 parts by weight of SiO 2 , it} is possible to improve adhesion in a high-temperature and high-humidity environment formed during tire driving while maintaining 10 kgf to 15 kgf, which is the initial adhesive strength of the semi-finished product.

In the present invention, SiO ₂ is included in the composition of the first compound 121 , thereby improving adhesion with the first cord 123 . The nylon material applied to the first cord 123 has _{a reactor of -R'CONH 2} , and these reactors undergo hydrolysis and amine decomposition by _{heat or moisture (H 2 O) generated while driving the tire, resulting in the first} Although the adhesive force between the cord 123 and the first compound 121 may be reduced, in the present invention, since SiO ₂ removes moisture generated during the driving of the tire, such a decrease in adhesive force may be prevented. Specifically, before hydrolysis and amine decomposition of the first cord 123 occur, SiO _{2 present in the first compound 121 and H 2} O generated from the outside react with the first cord 123 and the second 1 By suppressing the breakage of the adhesive layer 122 , the adhesive force between the first cord 123 and the first compound 121 may be maintained. That is, _{through the composition of the first compound 121 including SiO 2} , adhesive strength can be maintained even in a high temperature and humid environment, and durability performance of the tire can be improved.

4 and 6 , the body ply 130 may include a plurality of second cords 134 , a second adhesive layer 133 , a third adhesive layer 132 , and a second compound 131 .

The plurality of second cords 134 included in the body ply 130 may include PET.

The second adhesive layer 133 may be adhered to the surface of the second cord 134 . The second adhesive layer 133 may include epoxy.

The third adhesive layer 132 may be adhered to the surface of the second adhesive layer 133 . The third adhesive layer 132 may include resorcinol-formalin-latex (RFL). RFL has many -OH reactive groups, so that adhesion with the second compound 131 is generated.

The second compound 131 may be formed by topping the rubber composition on the second cord 134 on which the second adhesive layer 133 and the third adhesive layer 132 are formed. The second compound 131 may include a rubber composition. Specifically, the second compound 131 may include a rubber composition including _{SiO 2 .} The second compound 131 may include a polymer, a filler, an additive, and SiO ₂ .

Polymers include natural rubber, fluororubber, silicone rubber, latex, nylon, butyl rubber, halobutyl rubber, polyisobutene, NBR (acrylonitrile-butadiene rubber), EPDM (ethylene propylene diene rubber), ACM (acrylic rubber) , AEM (ethylene-acrylic rubber), SBR (styrene-butadiene rubber), EPR (ethylene-propylene copolymer), BR (butadiene rubber), CR (chloroprene rubber), CSM (chlorosulfonated polyethylene rubber), ECO ( Epichlorohydrin rubber), PET (Polyethylene terephthalate), PEN (Polyethylene naphthalate), PC (Poly Carbonate), PVC (Poly Vinylchloride), PA (Polyamide), PPS (Polyphenylene Sulfide), PK (Polyketone), EVOH (Ethylene) Vinyl Alcohol), PTFE (Polytetrafluoroethylene), phenolic resin, isocyanate compound, polyolefin, polyurethane, polychloroprene, polypropylene, polystyrene, polyester-based polymer, polyethylene-based polymer, and at least one selected from the group consisting of a thermoplastic elastomer may include.

The filler may be a carbon black-based filler.

Additives may include plasticizers, work aids, antioxidants or antioxidants, and the like.

SiO ₂ may be included in the form of silica particles or silica gel.

Here, the second compound 131 may include 50 to 70 parts by weight of the filler, 10 to 30 parts by weight of the additive, and 2 to 8 parts by _{weight of SiO 2 based on 100 parts by weight of the polymer.} When SiO ₂ is included in an amount of less than 2 parts by weight, the effect of removing moisture and improving the adhesion may be reduced. When SiO ₂ is included in excess of 8 parts by weight, the physical properties of the second compound 131 may vary. In the present invention, _{by including 2 to 8 parts by weight of SiO 2 , it} is possible to improve adhesion in a high-temperature and high-humidity environment formed during tire driving while maintaining 10 kgf to 15 kgf, which is the initial adhesive strength of the semi-finished product.

In the present invention, SiO ₂ is included in the composition of the second compound 131 , thereby improving adhesion with the second cord 134 . The PET material applied to the second cord 134 has a reactor of “-R'COOR”, and these reactors undergo hydrolysis and amine decomposition by _{heat or moisture (H 2 O) generated while driving the tire.} Although the adhesive force between the cord 134 and the second compound 131 may be reduced, in the present invention, since SiO ₂ removes moisture generated while the tire is running, such a decrease in adhesive force can be prevented. Specifically, before the hydrolysis and amine decomposition of the second cord 134 occur, SiO _{2 present in the second compound 131 and H 2} O generated from the outside react with the second cord 134, the first By suppressing the destruction of the second adhesive layer 133 and the third adhesive layer 132 , the adhesive force between the second cord 134 and the second compound 131 may be maintained. That is, _{through the composition of the second compound 131 including SiO 2} , adhesive strength can be maintained even in a high temperature and humid environment, and durability performance of the tire can be improved.

Features, structures, effects, etc. described in the above-described embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to one embodiment. Furthermore, features, structures, effects, etc. illustrated in each embodiment can be combined or modified for other embodiments by those of ordinary skill in the art to which the embodiments belong. Accordingly, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention.

In addition, although the embodiments have been described above, these are merely examples and do not limit the present invention, and those of ordinary skill in the art to which the present invention pertains are exemplified above in a range that does not depart from the essential characteristics of the present embodiment. It can be seen that various modifications and applications that have not been made are possible. For example, each component specifically shown in the embodiments may be implemented by modification. And the differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

Claims (6)

A tire mounted on a vehicle, comprising:
a tread portion including at least an area in contact with a road surface when the vehicle is driven;
a body ply disposed on the inside of the tread; and
Comprising a cap ply disposed between the body ply and the tread portion,
The cap ply includes a plurality of first cords and a first compound formed on the first cord,
The body ply includes a plurality of second cords and a second compound formed on the second cord,
The first compound and the second compound include a rubber composition including _{SiO 2 .} According to claim 1,
The rubber composition of the first compound and the second compound includes a polymer,
Based on 100 parts by weight of the polymer, the SiO ₂ is included in an amount of 2 to 8 parts by weight. According to claim 1,
The cap ply further includes a first adhesive layer formed on the first cord,
The first cord includes nylon, and the first adhesive layer includes resorcinol-formalin-latex (RFL). According to claim 1,
The body ply further includes a second adhesive layer and a third adhesive layer formed on the second cord,
wherein the second cord includes PET, the second adhesive layer includes epoxy, and the third adhesive layer includes resorcinol-formalin-latex (RFL). 3. The method of claim 2,
The rubber composition of the first compound further comprises a filler and an additive,
A tire comprising 30 to 50 parts by weight of a filler and 20 to 40 parts by weight of an additive based on 100 parts by weight of the polymer. 3. The method of claim 2,
The rubber composition of the second compound further comprises a filler and an additive,
A tire comprising 50 to 70 parts by weight of a filler and 10 to 30 parts by weight of an additive based on 100 parts by weight of the polymer.

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