KR20210035127A - Steel Cord plated with alloy containing Cu and Al, Tire Belt comprising the steel cord and Tire comprising the tire belt - Google Patents

Abstract

Provided are a steel cord plated with an alloy containing copper and aluminum, a tire belt including the same, and a tire including the same. According to the present invention, provided is a tire belt comprising: a steel cord plated with an alloy of copper and aluminum; and a rubber composition. In the alloy, the weight ratio of copper and aluminum is 1.597:1 to 1.899:1, the amount of copper plating is 2.15 to 2.29 g per 1 kg of steel wire, and the amount of aluminum plating is 1.21 to 1.35 g per 1 kg of steel wire.

Description

Steel Cord plated with alloy containing Cu and Al, Tire Belt comprising the steel cord and Tire comprising the tire belt

It relates to a steel cord plated with an alloy containing copper and aluminum, a tire belt including the same, and a tire including the same.

In general, the belt of the tire functions to increase the rigidity of the tread by overlapping a layer of steel cord. Therefore, the belt rubber should have good adhesion to the steel cord and should not age even after long-term driving.

Typically, the Cu/Zn plating layer used in the tire steel cord forms metal oxides (ZnO, CuO) on the steel cord surface, and after the vulcanization reaction, copper sulfide is generated through a complex step involving cobalt (Co) ions. , These copper sulfides are in close contact with the rubber layer to have adhesive strength. This serves to maintain the durability performance when driving the tire.

In the case of a steel cord, heat generated during tire driving and moisture penetrating, etc. deteriorate the adhesion between the rubber and the steel cord. Cu/Zn, which is a conventional steel cord plating layer, is susceptible to tire aging. In particular, during moist heat aging, a large amount of Zn ⁺² is dissolved in the brass layer and precipitated as Zn(OH) ₂ , destroying the adhesive layer as well as causing dezincification, which lowers the adhesion between the rubber and the steel cord.

Therefore, it is important to prevent a decrease in adhesion between the rubber and steel cord.

One aspect is to provide a steel cord for a tire belt in which the adhesion between the rubber and the steel cord is prevented.

Another aspect is to provide a tire belt comprising the steel cord and rubber composition.

Another aspect is to provide a tire provided with the tire belt.

According to one aspect,

A steel cord for a tire belt plated with an alloy containing copper and aluminum is provided.

According to the other side,

A tire belt comprising the steel cord and rubber composition is provided.

According to another aspect,

A tire provided with the tire belt is provided.

When applying a steel cord for tire belt plated with an alloy containing copper and aluminum according to one aspect, it shows excellent adhesive layer formation compared to the existing brass coated steel cord, and can maintain adhesive strength even during heat-resistance and moist heat aging. Driving stability can be improved.

1 is a view schematically showing the structure of a tire according to an embodiment.
Figure 2 is a schematic view showing the bonding mechanism between the brass coated steel cord and rubber layer of the prior art.
3 is a diagram schematically illustrating an adhesion mechanism between a steel cord plated with an alloy containing copper and aluminum and a rubber layer according to an embodiment.

Hereinafter, a steel cord according to an exemplary embodiment, a tire belt including the same, and a tire including the same will be described in more detail.

Since the inventive idea disclosed in the present specification can apply various transformations and have various implementations, specific implementations are described in detail in the detailed description, and when necessary, specific implementations are illustrated in the drawings. Effects and features of the creative ideas of the present specification, and a method of achieving them will be apparent with reference to implementation examples described later in detail together with the drawings. However, the creative idea of the present specification is not limited to the embodiments disclosed below, but may be implemented in various forms.

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

In the following embodiments, expressions in the singular include plural expressions unless the context clearly indicates otherwise.

In the following embodiments, terms such as include or have means that the features or elements described in the specification are present, and do not preclude the possibility of adding one or more other features or elements in advance.

When one embodiment can be implemented differently, a specific process order may be performed differently from the described order. For example, two processes described in succession may be performed substantially simultaneously, or may be performed in an order opposite to the described order.

Hereinafter, if necessary, embodiments of the present invention will be described in detail with reference to the accompanying drawings, and when describing with reference to the drawings, identical or corresponding components are given the same reference numerals, and redundant descriptions thereof will be omitted. It should be.

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

The steel cord for a tire belt according to one aspect is plated with an alloy comprising copper and aluminum.

According to one embodiment of the present invention, in the alloy plated on the steel cord, the plating amount of copper may be 2.15 to 2.29g per 1 kg of the steel wire, and the plating amount of aluminum in the alloy plated on the steel cord is 1.21 per kg of the steel wire. It may be ~ 1.35g. When the adhesion amount of copper and aluminum in the alloy to be plated is within the above ranges per 1 kg of steel wire, the adhesion between the steel cord and the rubber layer is optimal.

The alloy plated on the steel cord includes copper and aluminum, and for example, the alloy may be made of copper and aluminum.

Figure 2 is a schematic view showing a bonding mechanism between the brass-coated steel cord and rubber layer of the prior art.

The Cu/Zn plating layer of the existing steel cord forms metal oxides (ZnO, CuO) on the surface of the steel cord, and after the vulcanization reaction, sulfur (S) reacts with the Cu/Zn plating layer to produce copper sulfide, copper sulfide and zinc sulfide. do.

The adhesive layer of the rubber layer such as copper sulfide grows and adheres to each other to have adhesive strength. This serves to maintain the durability performance when driving the tire.

In Fig. 2, x is an arbitrary natural number representing the relative ratio of the bonds of copper and sulfur (the same applies to Fig. 3).

As time elapses, heat generated during tire driving, moisture penetrating, and the like decrease the adhesion between the rubber and the steel cord. Cu/Zn, which is a conventional steel cord plating layer, is susceptible to tire aging. In particular, during moist heat aging, a large amount of Zn ⁺² is dissolved in the brass layer and precipitated as Zn(OH) ₂ , which not only causes cracks in the lattice structure of the Cu/Zn plating layer due to dezincification, but also the generated Zn(OH) _Under the influence of 2, it destroys the adhesive layer of the rubber layer such as copper sulfide, thereby lowering the adhesive strength between the rubber and the steel cord.

3 is a diagram schematically illustrating an adhesion mechanism between a steel cord plated with an alloy containing copper and aluminum and a rubber layer according to an embodiment.

In the Cu/Al plating layer of the steel cord according to an embodiment of the present invention, Al is oxidized to Al ₂ O ₃ by oxidation to form a film, and the aluminum oxide film has a dense structure and has excellent wear resistance, corrosion resistance, and heat resistance. .

On the other hand, _{dealumination occurs in which Al forms Al(OH) 3 due} to moisture, but in the case of Al, the overall reaction rate is slower because the number of ^{OH − reacts per one cation than Zn.} Therefore, the steel cord for a tire belt plated with an alloy containing copper and aluminum according to an embodiment of the present invention can maintain excellent adhesion between the steel cord and the rubber layer for a longer time than the conventional Cu/Zn plated steel cord. .

The plating method of the steel cord according to the exemplary embodiment of the present invention may use a general method of the prior art, and is not particularly limited. For example, a plating method using electricity, a wet method using a metal ion solution, a method using plasma, or the like can be used. For example, in the case of a steel cord for a tire, a plating layer may be formed on the wire surface through an electrolytic acid treatment process in which an acidic solution is passed through an electrolytic cell, and a wet method using a metal ion solution.

According to one embodiment of the present invention, the weight ratio of copper and aluminum in the alloy plated on the steel cord may be 1.597:1 to 1.899:1. For example, the weight ratio of copper and aluminum may be 1.70:1 to 1.80:1. When the weight ratio of copper and aluminum in the alloy to be plated is within the above range, the adhesion between the steel cord and the rubber layer is optimal.

According to one embodiment of the present invention, the diameter of the steel cord is not limited, but may be preferably 0.6 ~ 1.2mm.

A tire belt according to another aspect includes the steel cord and rubber composition plated with an alloy containing copper and aluminum.

According to one embodiment of the present invention, the rubber composition may include natural rubber as a raw material rubber. The natural rubber may be a general natural rubber or a modified natural rubber.

The general natural rubber may be used as long as it is known as natural rubber, and the country of origin is not limited. The natural rubber mainly contains cis-1,4-polyisoprene, but may contain trans-1,4-polyisoprene depending on required properties. Therefore, in addition to natural rubber containing cis-1,4-polyisoprene as a main body, the natural rubber includes trans-1,4-isoprene as a main body, such as Valata, a kind of rubber of the Sapota family from South America. It may also contain rubber.

The modified natural rubber means that the general natural rubber is modified or purified. For example, examples of the modified natural rubber include epoxidized natural rubber (ENR), deproteinized natural rubber (DPNR), and hydrogenated natural rubber.

According to one embodiment of the present invention, the rubber composition may include a filler, for example, may include silica or carbon black.

Any of the silicas generally known may be used, and for example, commercially available Z-175, US7000GR, or 9000GR may be used.

When the content of the silica is less than 1 part by weight based on 100 parts by weight of the raw rubber, the effect of adding the silica is insignificant, and when it exceeds 20 parts by weight, there may be a problem in terms of processability.

The silica may have a nitrogen surface area per gram (N ₂ SA) of 100 to 180 m 2 /g, and a specific surface area of CTAB (cetyl trimethyl ammonium bromide) adsorption of 110 to 170 m 2 /g, but the present invention This is not limited to this.

When the nitrogen adsorption specific surface area of the silica is less than 100 m 2 /g, the reinforcing performance by silica as a filler may be disadvantageous, and when it exceeds 180 m 2 /g, the processability of the rubber composition may be disadvantageous. In addition, if the CTAB adsorption specific surface area of the silica is less than 110 m 2 /g, the reinforcing performance by silica as a filler may be disadvantageous, and if it exceeds 170 m 2 /g, the processability of the rubber composition may be disadvantageous.

The carbon black may have a nitrogen adsorption specific surface area (nitrogen surface area per gram, N ₂ SA) of 30 to 300 m ² /g, and an oil absorption of DBP (n-dibutyl phthalate) of 60 to 180 cc/100 g, but the present invention This is not limited to this.

When the nitrogen adsorption specific surface area of the carbon black ^{exceeds 300 m 2} /g, the processability of the rubber composition for tires may be disadvantageous, and ^{when it is less than 30 m 2} /g, the reinforcing performance by carbon black as a filler may be disadvantageous. In addition, when the DBP oil absorption amount of the carbon black exceeds 180cc/100g, the processability of the rubber composition may be deteriorated, and when it is less than 60cc/100g, the reinforcing performance by carbon black as a filler may be disadvantageous.

Representative examples of the carbon black include N110, N121, N134, N220, N231, N234, N242, N293, N299, S315, N326, N330, N332, N339, N343, N347, N351, N358, N375, N539, N550, N582 , N630, N642, N650, N683, N754, N762, N765, N774, N787, N907, N908, N990 or N991.

The carbon black may be included in an amount of 30 to 80 parts by weight, preferably 45 to 65 parts by weight, and more preferably 53 to 57 parts by weight based on 100 parts by weight of the raw rubber. If the content of the carbon black is less than 30 parts by weight, the reinforcing performance by the carbon black as a filler may be deteriorated, and if it exceeds 80 parts by weight, the processability of the rubber composition may be disadvantageous.

The tire belt rubber composition may optionally further include various additives such as an additional vulcanization agent, a vulcanization accelerator, a vulcanization accelerator, an anti-aging agent, an antioxidant, or a softener. Any of the various additives may be used as long as they are commonly used in the field to which the present invention belongs, and their content is not particularly limited as it depends on the blending ratio used in a typical tire belt rubber composition.

As the vulcanizing agent, a sulfur-based vulcanizing agent can be preferably used. The sulfur-based vulcanizing agents include inorganic vulcanizing agents such as powdered sulfur (S), insoluble sulfur (S), precipitated sulfur (S), and colloidal sulfur, and tetramethylthiuram disulfide (TMTD), tetraethyl Organic vulcanizing agents such as tetraethyltriuram disulfide (TETD) and dithiodimorpholine may be used. As the sulfur vulcanizing agent, specifically elemental sulfur or a vulcanizing agent that produces sulfur, for example, amine disulfide, polymer sulfur, or the like may be used.

It is preferable that the vulcanizing agent be included in an amount of 0.5 to 10.0 parts by weight based on 100 parts by weight of the raw rubber, as an appropriate vulcanizing effect, and that the raw rubber is less sensitive to heat and is chemically stable.

The vulcanization accelerator refers to an accelerator that accelerates the vulcanization rate or accelerates the delaying action in the initial vulcanization step.

The vulcanization accelerators include sulfenamide-based, thiazole-based, thiuram-based, thiourea-based, guanidine-based, dithiocarbamic acid-based, aldehyde-amine-based, aldehyde-ammonia-based, imidazoline-based, xanthate-based and these Any one selected from the group consisting of combinations may be used.

Examples of the sulfenamide-based vulcanization accelerator include N-cyclohexyl-2-benzothiazylsulfenamide (CBS), N-tert-butyl-2-benzothiazylsulfenamide (TBBS), and N,N-dicyclohexyl Any one selected from the group consisting of -2-benzothiazylsulfenamide, N-oxydiethylene-2-benzothiazylsulfenamide, N,N-diisopropyl-2-benzothiazolesulfenamide, and combinations thereof Sulfenamide-based compounds of can be used.

Examples of the thiazole-based vulcanization accelerator include 2-mercaptobenzothiazole (MBT), dibenzothiazyl disulfide (MBTS), sodium salt of 2-mercaptobenzothiazole, and zinc salt of 2-mercaptobenzothiazole. , Copper salt of 2-mercaptobenzothiazole, cyclohexylamine salt of 2-mercaptobenzothiazole, 2-(2,4-dinitrophenyl)mercaptobenzothiazole, 2-(2,6-di Any one thiazole-based compound selected from the group consisting of ethyl 4-morpholinothio)benzothiazole and combinations thereof may be used.

Examples of the thiuram-based vulcanization accelerator include tetramethyl thiuram disulfide (TMTD), tetraethyl thiuram disulfide, tetramethyl thiuram monosulfide, dipentamethylene thiuram disulfide, dipentamethylene thiuram monosulfide, dipentamethylene Thiuram tetrasulfide, dipentamethylene thiuram hexasulfide, tetrabutyl thiuram disulfide, pentamethylene thiuram tetrasulfide, and any one thiuram-based compound selected from the group consisting of a combination thereof may be used.

As the thiourea-based curing accelerator, for example, any one thiourea-based selected from the group consisting of thiacarbamide, diethylthiourea, dibutylthiourea, trimethylthiourea, diorthotolylthiourea, and combinations thereof Compounds can be used.

As the guanidine-based vulcanization accelerator, for example, any one guanidine-based compound selected from the group consisting of diphenylguanidine, diorthotolylguanidine, triphenylguanidine, orthotolylbiguanide, diphenylguanidine phthalate, and combinations thereof can be used. I can.

Examples of the dithiocarbamic acid-based vulcanization accelerator include zinc ethylphenyldithiocarbamate, zinc butylphenyldithiocarbamate, sodium dimethyldithiocarbamate, zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, Zinc dibutyldithiocarbamate, zinc diamyldithiocarbamate, zinc dipropyldithiocarbamate, complex salt of zinc pentamethylenedithiocarbamate and piperidine, zinc hexadecylisopropyldithiocarbamate, octadecyl Zinc isopropyldithiocarbamate, zinc dibenzyldithiocarbamate, sodium diethyldithiocarbamate, piperidine pentamethylenedithiocarbamate, selenium dimethyldithiocarbamate, tellurium diethyldithiocarbamate, dia Any one dithiocarbamic acid-based compound selected from the group consisting of cadmium mildithiocarbamate and combinations thereof may be used.

Examples of the aldehyde-amine-based or aldehyde-ammonia-based vulcanization accelerator include, for example, an aldehyde selected from the group consisting of acetaldehyde-aniline reactant, butylaldehyde-aniline condensate, hexamethylenetetramine, acetaldehyde-ammonia reactant, and combinations thereof. -Amine-based or aldehyde-ammonia-based compounds can be used.

As the imidazoline-based vulcanization accelerator, an imidazoline-based compound such as 2-mercaptoimidazoline may be used, and as the xanthate-based vulcanization accelerator, for example, a xanthate-based zinc dibutylxanthogenate or the like can be used. Compounds can be used.

The vulcanization accelerator may be included in an amount of 0.5 to 4.0 parts by weight based on 100 parts by weight of the raw rubber in order to maximize productivity and rubber properties through acceleration of the vulcanization speed.

The vulcanization accelerator aid is a blending agent used in combination with the vulcanization accelerator to complete the accelerating effect, and any one selected from the group consisting of inorganic vulcanization accelerators, organic vulcanization accelerators, and combinations thereof may be used. .

As the inorganic vulcanization accelerator, any one selected from the group consisting of zinc oxide (ZnO), zinc carbonate, magnesium oxide (MgO), lead oxide, potassium hydroxide, and combinations thereof can be used. have. The organic vulcanization accelerator is selected from the group consisting of stearic acid, zinc stearate, palmitic acid, linoleic acid, oleic acid, lauric acid, dibutyl ammonium oleate, derivatives thereof, and combinations thereof. You can use any one of them.

In particular, the zinc oxide and the stearic acid may be used together as the vulcanization accelerator, and in this case, the zinc oxide is dissolved in the stearic acid to form an effective complex with the vulcanization accelerator, thereby reducing advantageous sulfur during the vulcanization reaction. It facilitates the crosslinking reaction of the rubber by making it.

When the zinc oxide and the stearic acid are used together, it may be used in an amount of 1 to 10 parts by weight and 0.5 to 3 parts by weight based on 100 parts by weight of the raw rubber, respectively, to serve as an appropriate vulcanization accelerator. When the content of the zinc oxide and the stearic acid is less than the above range, the vulcanization rate may be slow and productivity may decrease, and when the content of the zinc oxide and the stearic acid exceed the above range, a scorch phenomenon may occur and physical properties may be reduced.

The softening agent is added to the rubber composition to facilitate processing by imparting plasticity to the rubber or to reduce the hardness of the vulcanized rubber, and refers to oils and other materials used during rubber compounding or rubber production. The softener means process oil or oils included in other rubber compositions. As the softener, any one selected from the group consisting of petroleum oils, vegetable oils, and combinations thereof may be used, but the present invention is not limited thereto.

As the petroleum oil, any one selected from the group consisting of paraffin oil, naphthenic oil, aromatic oil, and combinations thereof may be used.

Representative examples of the paraffinic oil include P-1, P-2, P-3, P-4, P-5, and P-6 of Michang Oil Co., Ltd., and a representative example of the naphthenic oil is Michang Oil. N-1, N-2, and N-3 of Co., Ltd. may be mentioned, and representative examples of the aromatic oil include A-2 and A-3 of Michang Oil Co., Ltd.

However, it is known that cancer-causing potential is high when the content of polycyclic aromatic hydrocarbons (hereinafter referred to as PAHs) contained in the aromatic oil is 3% by weight or more along with the recent increase in environmental awareness, TDAE ( Treated distillate aromatic extract) oil, mild extraction solvate (MES) oil, residual aromatic extract (RAE) oil, or heavy naphthenic oil may be preferably used.

In particular, the oil used as the softener has a total content of PAHs of 3% by weight or less with respect to the entire oil, a kinematic viscosity of 95 or more (210°F SUS), an aromatic component in the softener of 15 to 25% by weight, and a naphthenic component TDAE oil having 27 to 37% by weight and 38 to 58% by weight of the paraffinic component can be preferably used.

The TDAE oil is advantageous in terms of environmental factors such as cancer-causing potential of PAHs while improving low-temperature characteristics and fuel economy performance of tires including the TDAE oil.

The plant oils include castor oil, cottonseed oil, linseed oil, canola oil, soybean oil, palm oil, palm oil, peanut oil, pine oil, pine tar, tall oil, corn oil, rice bran oil, safflower oil, sesame oil, olive oil, sunflower oil, palm kernel oil, camellia oil , Jojoba oil, macadamia nut oil, saflower oil, tung oil, and any one selected from the group consisting of a combination thereof may be used.

The softening agent is preferably used in an amount of 0 to 10 parts by weight based on 100 parts by weight of the raw rubber in that it improves the processability of the raw rubber.

The anti-aging agent is an additive used to stop a chain reaction in which the tire is automatically oxidized by oxygen. As the anti-aging agent, any one selected from the group consisting of amine-based, phenol-based, quinoline-based, imidazole-based, carbamic acid metal salts, waxes, and combinations thereof may be appropriately selected and used.

Examples of the amine-based anti-aging agent include N-phenyl-N'-(1,3-dimethyl)-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, N-phenyl-N'-isopropyl-p-phenylenediamine, N,N'-diphenyl-p-phenylenediamine, N,N'-diaryl-p-phenylenediamine, N-phenyl-N' -Any one selected from the group consisting of cyclohexyl p-phenylenediamine, N-phenyl-N'-octyl-p-phenylenediamine, and combinations thereof may be used. The phenolic antioxidants include phenolic 2,2'-methylene-bis(4-methyl-6-tert-butylphenol), 2,2'-isobutylidene-bis(4,6-dimethylphenol), 2 ,6-di-t-butyl-p-cresol, and any one selected from the group consisting of combinations thereof may be used. As the quinoline-based antioxidant, 2,2,4-trimethyl-1,2-dihydroquinoline and derivatives thereof may be used, and specifically, 6-ethoxy-2,2,4-trimethyl-1,2-di Consisting of hydroquinoline, 6-anilino-2,2,4-trimethyl-1,2-dihydroquinoline, 6-dodecyl-2,2,4-trimethyl-1,2-dihydroquinoline and combinations thereof Any one selected from the group can be used. As the wax, waxy hydrocarbon may be preferably used.

In addition to the anti-aging effect, the anti-aging agent must have a high solubility in rubber, low volatility, and inert to rubber, and not inhibit vulcanization, etc., 1 to 10 parts by weight of the raw rubber. It may be included in parts by weight.

A typical amount of the antioxidant may be included in, for example, about 1 to about 5 parts by weight. Representative antioxidants are, for example, diphenyl-p-phenylenediamine and others, but are not limited thereto.

Referring to FIG. 1, the tire 10 includes a tread part 100, a sidewall part 200, and a bead part 300.

The tread portion 100 is a portion in contact with the ground in cross section, and serves to protect the tire from impact and trauma from the road surface. A plurality of blocks partitioned by grooves may be formed on the surface of the tread portion as described above to improve the drainage characteristics of the tire.

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

The sidewall 200 is a part that extends from both ends of the tread to form side surfaces of the tire, withstands continuously repeated contraction and expansion during driving, and protects the carcass layer 400 located on the inner surface. Do it.

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

A carcass layer 400 is positioned between the pair of left and right bead portions 300, and is bonded to the tire rubber sheet inside the tire to form the skeleton of the tire, and the carcass layer 400 is the bead core 500 ) It is winding up from the inside of the tire to the outside.

An inner liner 700 is positioned on one side of the inner side of the carcass layer 400 and serves to prevent air inside the tire from escaping to the outside.

The belt layer 600 may be positioned on the outer surface of the carcass layer 400 located on the tread portion 100 as a reinforcing layer that increases the elasticity of the tread and has maneuverability and stability.

The belt layer 600 includes a steel cord plated with an alloy containing copper and aluminum according to an embodiment of the present invention, and a tire belt including a rubber composition.

The structure of the steel cord of the tire belt according to the embodiment of the present invention is not particularly limited. For example, the structure of the steel cord of the tire belt may be 2×0.30.

The tire belt rubber composition may include a cobalt compound.

The cobalt compound is cobalt salt, cobalt-boron ester, organic acid cobalt salt, inorganic acid cobalt salt, non-cobalt salt, and the like, and as an adhesion system, cobalt salt alone, cobalt-RH, cobalt-HRH, and other resins [for example, Methylene acceptor: phenolic, resorcinol, cresol, etc., or donor: hexamethylenetetraamine (HMT), hexamethoxymethylmelamine (HMMA), pentamethoxymethylmelamine (PMMA)] have.

In general, to improve adhesion, improve the adhesion system of adhesive compounded rubber (cobalt-RH, cobalt-HRH, their modification system), improve resins used as adhesion aids and improve performance, improve cobalt salts used as adhesion aids, adhesion Improvements in the vulcanization system of rubber and the use of new compounding compositions (reinforcing agents, carbon black, silica, polymers, chemicals) are being used.

The content of the cobalt compound may include 0.2 to 5.0 parts by weight based on 100 parts by weight of the raw rubber, but is not limited thereto.

When the content of the cobalt compound is less than 0.2 parts by weight based on 100 parts by weight of the raw rubber, the effect of adding the silica is insignificant, and when it exceeds 5.0 parts by weight, there may be a problem that the adhesive strength decreases.

The tire belt rubber composition may be manufactured through a conventional two-step continuous manufacturing process. That is, during the first step of thermomechanical treatment or kneading at a maximum temperature ranging from 110 to 190°C, preferably at a high temperature of 130 to 180°C and the finishing step in which the crosslinking system is mixed, typically less than 110°C, for example It can be prepared in a suitable mixer by using the second step of mechanical treatment at a low temperature of 40 to 100 ℃, but is not limited thereto.

A tire according to another aspect of the present invention includes the step of using the belt when forming a green tire. The method of manufacturing a tire belt using the tire belt rubber composition and the method of forming a green tire using a regular belt can be applied to any method as long as it is a method conventionally used for manufacturing a tire. Description is omitted.

A cap ply 800 including a hybrid cord may be disposed between the belt layer 600 and the tread portion 100. The cap ply 800 may suppress the flow of the belt layer 600 during driving to maintain the performance of the tire.

1 illustrates a tire for a passenger car, but is not limited thereto, and may be a tire for a passenger car, a tire for racing, an airplane tire, a tire for agricultural machinery, an off-the-road tire, a truck tire, a bus tire, and the like. have. Further, the tire may be a radial tire or a bias tire, preferably a radial tire.

The present invention will be described in more detail through the following examples and comparative examples. However, the examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

Steel cord (2×0.30 SHT)

Copper and zinc alloy plating

A steel cord was prepared so that two strands were twisted on a steel cord plated with an alloy of 0.3mm in diameter and copper and zinc to have a twist pitch of 14.0±1.0 (S).

Copper plating adhesion: 2.22g per 1 kg of steel wire

Zinc plating amount: 1.28g per 1kg of steel wire

Copper and aluminum alloy plating

A steel cord was prepared so that two strands were twisted on a steel cord plated with an alloy of 0.3 mm in diameter, copper and aluminum to have a twist pitch of 14.0±1.0 (S).

Copper plating adhesion: 2.22g per 1kg of steel wire

Aluminum plating amount: 1.28g per 1 kg of steel wire

The physical properties were measured for each of the above codes, and the results are shown in Table 1 below.

Code (2×0.30 SHT) Cord diameter (mm) Linear density (g/m) Cutting elongation (%) Strong (kgf) Cu/Zn alloy plating 0.6 1.12 2.0 45 Cu/Al alloy plating 0.6 1.12 2.0 45

Example 1 and Comparative Example 1 A rubber composition for a belt was blended by adding the composition shown in Table 2 below to a Banbari mixer.

material Parts by weight (phr) combination
(Part by weight) Natural rubber 100 Carbon black ¹⁾ 60 Stearic acid One Active ZnO 10.0 Anti-aging agent ²⁾ 2.5 Antioxidant ³⁾ 0.5 Wax ⁴⁾ 0.15 sulfur 7.5 Accelerator ⁵⁾ 0.5 Cobalt ⁶⁾ 1.0

1) Carbon black: N2342) Anti-aging agent: N-(1,3-DIMETHYLBUTYL)-N-PHENYL-P-PHENYLENDIAMINE

3) Antioxidant: 2,2,4-TRIMETHYL-1,2-DIHYDROQUINOLINE, POLYMERIZED

4) Wax: ISO-PARAFFINE + NORMAL PARAFFINE

5) Accelerator: N,N-Dicyclohexyl-2-benzothiazolesulfenamide

6) Cobalt: COBALT BORO NEODECANOATE

Comparative Example 1

The steel cord plated with the Cu/Zn alloy was put into the rubber sheet prepared above, and a cured specimen was prepared at 160° C. for 16 minutes in a curing machine.

Example 1

A vulcanized specimen was prepared in the same manner as in Comparative Example 1, except that a steel cord plated with the Cu/Al alloy was used.

Evaluation example

The physical properties of the specimens prepared in Example 1 and Comparative Example 1 were evaluated as follows, and the results are shown in Table 3 below. The numerical values in Table 3 below are expressed by indexing Comparative Example 1 based on 100, and the higher the heat resistance and wet heat adhesion values, the better.

Heat-resistant adhesion measurement

It was measured according to ASTM standard (D4776-98). Heat-resistant adhesion is the value of adhesion between the steel cord and vulcanized rubber at high temperatures, and the higher the value, the higher the safety of the tire.

Moist heat adhesion measurement

It was measured according to ASTM standard (D4776-98). Moist heat adhesion is a value that indicates the adhesion between steel cord and vulcanized rubber in a high temperature and humid environment. The higher the value, the higher the safety of the tire.

Comparative Example 1 Example 1 evaluation Heat-resistant adhesion 100 104 Moist heat adhesion 100 109

From the results of Table 3, it can be seen that a belt including a steel cord plated with a Cu/Al alloy is superior to a belt including a steel cord plated with a Cu/Zn alloy.

10: tire 100: tread portion
200: side wall portion 300: bead portion
400: carcass layer 500: bead core
600: belt layer 700: inner liner
800: cap fly

Claims (4)

A steel cord plated with an alloy made of copper and aluminum; And
As a tire belt consisting of; a rubber composition,
The weight ratio of copper and aluminum in the alloy is 1.597:1 to 1.899:1,
The plating amount of copper is 2.15 ~ 2.29g per 1 kg of steel wire,
The amount of aluminum plating is 1.21 ~ 1.35g per 1 kg of steel wire,
Between the rubber composition and the steel cord
A layer made of copper sulfide (CuxS) and aluminum sulfide (AlxS)/Al ₂ O ₃ layer/alloy layer made of copper and aluminum is located,
The layer made of copper sulfide (CuxS) and aluminum sulfide (AlxS) is in contact with the rubber composition (x is a number representing the relative ratio at which copper and aluminum bond with sulfur),
The alloy layer made of copper and aluminum is in contact with the steel cord,
In the Al ₂ O ₃ layer,
The aluminum of the alloy forms _{Al(OH) 3 by the infiltrating moisture,}
The rubber composition is natural rubber, carbon black (N234), stearic acid, active ZnO, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, 2,2,4-trimethyl-1, Tire belt comprising 2-dihydroquinoline, wax, sulfur, N,N-dicyclohexyl-2-benzothiazylsulfenamide and cobalt. The tire belt according to claim 1, wherein the steel cord has a diameter of 0.6 to 1.2 mm. The tire belt according to claim 1, wherein the steel cord has a structure of 2×0.30. A tire provided with the tire belt of claim 1.

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