KR20140077524A - Rubber composition for non-pneumatic tire tread, tire manufactured by using the same and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a rubber composition for a non-pneumatic tire tread, a non-pneumatic tire manufactured by using the same, and a method for manufacturing the same, wherein the rubber composition for a non-pneumatic tire tread comprises 100 parts by weight of a rubber material, 10-100 parts by weight of a reinforcing filler and 5-10 parts by weight of processing oil comprising hydroxy terminated polybutadien (HTPB). The rubber composition for a non-pneumatic tire tread can highly and environmental friendly increase adhesion with a spoke made of a urethane material.

Description

TECHNICAL FIELD [0001] The present invention relates to a rubber composition for a non-publicly-charged tire tread, a non-publicly-recruited tire manufactured using the same, and a method for manufacturing the same. BACKGROUND ART [0002]

More particularly, the present invention relates to a rubber composition for a non-publicly-charged tire tread, a non-publicly-written tire using the same, Rubber composition, a non-publicly-written tire manufactured using the same, and a method of manufacturing the same.

In the case of making a urethane tire when manufacturing a non-proprietary tire, the braking performance at the time of contact with the road surface is half of that of the rubber tire, and technological improvement is required to replace the non-entry tire with the rubber tire.

To improve this, we tried to improve the braking performance by attaching urethane spokes to the tread of the rubber tire.

As a method for improving the adhesion between the urethane spokes and the tread of the non-publicly-written tire, there has been used a method of applying an adhesive to the surface of the tread to bond the spokes. However, This short adhesive must be manufactured every time it is used, and there is environmental restriction in using adhesives in the field because it requires penetration of the adhesive into the tread using an organic solvent which is harmful to the human body when manufacturing the adhesive.

Korea Patent Publication No. 2012-0070469 (Publication date: June 29, 2012) Korea Patent Publication No. 2012-0096149 (Publication date: Aug. 30, 2012) Korea Patent Publication No. 2012-0096132 (Publication date: Aug. 30, 2012)

SUMMARY OF THE INVENTION An object of the present invention is to provide a rubber composition for a nontraditional tire tread capable of significantly improving the adhesion of a urethane rubber material to a spoke.

Another object of the present invention is to provide a non-publicly-added tire produced using the rubber composition for the non-publicly-charged tire tread.

It is still another object of the present invention to provide a method of manufacturing the non-publicly-written tire.

In order to achieve the above object, a rubber composition for a non-publicly-applied tire tread according to an embodiment of the present invention comprises 100 parts by weight of a raw rubber, 10 to 100 parts by weight of a reinforcing filler, and a hydroxy terminated polybutadiene (HTPB) 5 to 10 parts by weight of a process oil.

Wherein the hydroxyl group-terminated polybutadiene has a hydroxyl value of 44.9 to 56.1 mgKOH / g, a viscosity of 25 to 100 poise, a specific gravity of 25 to 40 ° C. of 0.8911 to 0.9111, The functionality may be 2.3 to 2.5.

The hydroxyl-terminated polybutadiene may have a water content of 0.1 wt% or less, a peroxide content of 500 ppm or less, and a non-volatile matter content of 99.90 wt% or more.

A method for manufacturing a non-tired tire according to another embodiment of the present invention includes the steps of vulcanizing a rubber composition for a non-publicly-charged tire tread to produce a vulcanized rubber, applying an adhesive to the vulcanized rubber and bonding a urethane- .

The method may further include a step of heat-treating the vulcanized rubber at 100 to 110 ° C for 3 to 5 hours before the step of bonding the spokes.

A non-tired tire according to another embodiment of the present invention can be manufactured by the method of manufacturing the non-tired tire.

Hereinafter, the present invention will be described in more detail.

A rubber composition for a non-publicly-applied tire tread according to an embodiment of the present invention comprises 100 parts by weight of raw rubber, 10 to 100 parts by weight of a reinforcing filler, and 5 to 100 parts by weight of a process oil 5 to 20 parts by weight of a hydroxy terminated polybutadiene (HTPB) 10 parts by weight.

The raw material rubber may be any one selected from the group consisting of natural rubber, synthetic rubber, and combinations thereof.

The natural rubber may be a general natural rubber or a modified natural rubber.

The above-mentioned general natural rubber may be used as long as it is known as natural rubber, and the country of origin and the like are not limited. The natural rubber includes cis-1,4-polyisoprene as a main component, but may also include trans-1,4-polyisoprene depending on required characteristics. Therefore, in addition to natural rubber containing cis-1,4-polyisoprene as a main component, natural rubber including trans-1,4-isoprene as a main component, such as balata, Rubber may also be included.

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.

The natural rubber may preferably be used as a rubber composition for a tire rim cushion in which the foreign matter content is 0.2 wt% or less and the specific gravity is 0.90 to 0.99.

Wherein the butadiene rubber has a Mooney viscosity (ML1 + 4, 100 占 폚) of 35 to 50, a number average molecular weight of 100,000 to 500,000 and a molecular weight distribution of 3.0 to 4.0 Lt; / RTI > That is, the butadiene rubber has a high molecular chain linearity, a high cis-1,4-butadiene content, and a narrow molecular weight distribution. When such a butadiene rubber is used, the heat-generating property and rebound resilience are excellent.

The raw rubber includes 20 to 80 parts by weight of the natural rubber and 20 to 80 parts by weight of butadiene rubber. If the content of the natural rubber is less than 20 parts by weight, the butadiene rubber may relatively increase and the workability may be deteriorated. When the amount exceeds 80 parts by weight, the workability is favorable but the physical properties such as rebound resilience or heat generation may be deteriorated.

The reinforcing filler may be silica, and in order to improve dispersibility of the silica, the non-tired tire may further include a coupling agent.

The silica may be a precipitable silica having a BET specific surface area of 100 to 180 m ² / g and a DBP oil absorption of 180 to 200 cc / 100 g. If the BET specific surface area of the silica is less than 100 m < 2 > / g, the reinforcing performance by the silica as the filler may be deteriorated, and if it exceeds 180 m < 2 > / g, If the DBP oil absorption of the silica is less than 180 cc / 100 g, the reinforcing performance by the silica as the filler may be deteriorated. If the amount exceeds 200 cc / 100 g, the workability of the rubber composition may be deteriorated.

The silica may be included in an amount of 10 to 100 parts by weight, preferably 70 to 90 parts by weight, based on 100 parts by weight of the raw material rubber. If the content of the silica exceeds 90 parts by weight, the rotational resistance performance may be decreased, and if it is less than 10 parts by weight, the wear performance and the wet and dry handling performance may be deteriorated.

The coupling agent used for improving the dispersibility of the silica may be a silane coupling agent. Examples of the silane coupling agent include a sulfide-based silane compound, a mercapto-based silane compound, a vinyl-based silane compound, an amino-based silane compound, a glycidoximide silane compound, a nitro- based silane compound, a chlorinated silane compound, Or a combination thereof.

The coupling agent may be included in an amount of 6.3 to 7.2 parts by weight based on 100 parts by weight of the raw rubber. When the content of the coupling agent is less than 6.3 parts by weight, the reaction with silica may be insufficient to lower the workability of the rubber or deteriorate the fuel efficiency. When the amount of the coupling agent exceeds 7.2 parts by weight, the interaction between silica and rubber is too strong, Can be excellent, but the braking performance may be deteriorated.

On the other hand, when the tread of the non-tired tire is made of urethane, the braking performance shows a level at which the braking performance does not reach even half of the pneumatic tire, so that the rubber composition for the non-padded tire tread is a pneumatic tire, So that the non-airbag tire can be manufactured.

At this time, the processing oil including the hydroxy terminated polybutadiene (HTPB) allows the adhesive agent to easily penetrate into the tread without using an organic solvent when adhering to the urethane spoke, and the tread and the urethane- The adhesive strength can be greatly improved.

Wherein the hydroxyl group-terminated polybutadiene has a hydroxyl value of 44.9 to 56.1 mgKOH / g, a viscosity of 25 to 100 poise, a specific gravity of 25 to 40 ° C. of 0.8911 to 0.9111, A functionality of 2.3 to 2.5, a water content of 0.1 wt% or less, a peroxide content of 500 ppm or less, and a non-volatile matter content of 99.90 wt% or more. When hydroxyl-terminated polybutadiene having such physical properties as described above is used, it is advantageous in forming an adhesive force due to the reaction of hydroxyl group and isocyanate, and has a linear structure.

The working oil may be included in an amount of 5 to 10 parts by weight based on 100 parts by weight of the raw material rubber. When the content of the processing oil is less than 5 parts by weight, there is a problem in that the bonding strength is weak. When the amount is more than 10 parts by weight, there is a problem in mixing the starting rubber itself.

The rubber composition for the nontranscribed tire tread may further include various additives such as an additional vulcanizing agent, a vulcanization accelerator, a vulcanization accelerator, an anti-aging agent or a softening agent. Any of the various additives may be used as long as they are commonly used in the field to which the present invention belongs. The content thereof is not particularly limited as long as it depends on the compounding ratio used in a rubber composition for a nontraditional tire tread.

As the vulcanizing agent, metal oxides such as sulfur vulcanizing agents, organic peroxides, resin vulcanizing agents, and magnesium oxide can be used.

The sulfur vulcanizing agent is an inorganic vulcanizing agent such as powder sulfur (S), insoluble sulfur (S), precipitated sulfur (S), colloid sulfur, etc., tetramethylthiuram disulfide (TMTD) Organic vulcanizing agents such as tetraethyltriuram disulfide (TETD) and dithiodimorpholine can be used. As the sulfur vulcanizing agent, a vulcanizing agent which produces elemental sulfur or sulfur, for example, amine disulfide, polymer sulfur and the like can be used.

The organic peroxide is selected from the group consisting of benzoyl peroxide, dicumyl peroxide, di-t-butyl peroxide, t-butyl cumyl peroxide, methyl ethyl ketone peroxide, cumene hydroperoxide, 2,5- butylperoxy) hexane, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, 2,5- Bis (t-butylperoxypropyl) benzene, di-t-butylperoxy-diisopropylbenzene, t-butylperoxybenzene, 2,4-dichlorobenzoylperoxide, 1,1- , 3,5-trimethylsiloxane, n-butyl-4,4-di-t-butylperoxyvalerate, and combinations thereof.

It is preferable that the vulcanizing agent is included in an amount of 0.5 to 2.5 parts by weight based on 100 parts by weight of the raw material rubber, since the raw rubber is less sensitive to heat and chemically stable.

The vulcanization accelerator refers to an accelerator that promotes the vulcanization rate or accelerates the retardation in the initial vulcanization step.

Examples of the vulcanization accelerator include sulfenamide, thiazole, thiuram, thiourea, guanidine, dithiocarbamate, aldehyde-amine, aldehyde-ammonia, imidazoline, Or a combination thereof.

Examples of the sulfenamide type vulcanization accelerator include N-cyclohexyl-2-benzothiazyl sulfenamide (CBS), N-tert-butyl-2-benzothiazyl sulfenamide (TBBS), N, N-dicyclohexyl -2-benzothiazyl sulfenamide, N-oxydiethylene-2-benzothiazyl sulfenamide, N, N-diisopropyl-2-benzothiazole sulfenamide, and combinations thereof Based compound can be used.

Examples of the thiol-based vulcanization accelerator include 2-mercaptobenzothiazole (MBT), dibenzothiazyl disulfide (MBTS), sodium salt of 2-mercaptobenzothiazole, zinc salt of 2-mercaptobenzothiazole , A copper salt of 2-mercaptobenzothiazole, a cyclohexylamine salt of 2-mercaptobenzothiazole, 2- (2,4-dinitrophenyl) mercaptobenzothiazole, 2- Ethyl 4-morpholinothio) benzothiazole, and combinations thereof. The thiazole-based compound may be used alone or in combination of two or more thereof.

Examples of the thiuram-based vulcanization accelerator include tetramethylthiuram disulfide (TMTD), tetraethylthiuram disulfide, tetramethylthiuram monosulfide, dipentamethylthiuram disulfide, dipentamethylthiuram monosulfide, dipentamethylene Any one of thiuram-based compounds selected from the group consisting of thiuram tetrasulfide, dipentamethylenethiuram hexasulfide, tetrabutylthiuram disulfide, pentamethylenethiuram tetrasulfide, and combinations thereof can be used.

Examples of the thiourea vulcanization accelerator include thiourea compounds selected from the group consisting of thiacarbamide, diethyl thiourea, dibutyl thiourea, trimethyl thiourea, diorthotolyl thiourea, and combinations thereof. Compounds may be used.

Examples of the guanidine-based vulcanization accelerator include guanidine-based compounds selected from the group consisting of diphenyl guanidine, diorthotolyl guanidine, triphenyl guanidine, orthotolyl biguanide, diphenyl guanidine phthalate, and combinations thereof .

Examples of the dithiocarbamate-based vulcanization accelerator include zinc ethylphenyldithiocarbamate, zinc butylphenyldithiocarbamate, sodium dimethyldithiocarbamate, zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, Zinc dibutyldithiocarbamate, zinc diamidithiocarbamate, zinc dipropyldithiocarbamate, complexation of zinc with piperidinedithiocarbamate and piperidine, zinc hexadecylisopropyldithiocarbamate, octadecyl Isopropyl dithiocarbamic acid zinc zinc dibenzyldithiocarbamate, sodium diethyldithiocarbamate, penta methylenedithiocarbamate, sodium selenium dimethyldithiocarbamate, diethyldithiocarbamate, sodium diethyldithiocarbamate, Cadmium dithiocarbamate, and combinations thereof. The dithiocarbamic acid-based compound may be used alone or in combination of two or more thereof.

Examples of the aldehyde-amine type or aldehyde-ammonia type vulcanization accelerator include aldehyde selected from the group consisting of acetaldehyde-aniline reactant, butylaldehyde-aniline condensate, hexamethylenetetramine, acetaldehyde-ammonia reactant, -Amine-based or aldehyde-ammonia-based compounds may be used.

As the imidazoline-based vulcanization accelerator, for example, an imidazoline-based compound such as 2-mercaptoimidazoline can be used. Examples of the xanthate vulcanization accelerator include xanthates such as zinc dibutylxanthogenate Compounds may be used.

The vulcanization accelerator may be included in an amount of 0.5 to 5 parts by weight with respect to 100 parts by weight of the raw rubber in order to maximize productivity improvement and rubber property enhancement through vulcanization speed promotion.

The vulcanization accelerating assistant may be any one selected from the group consisting of an inorganic vulcanization accelerator aid, an organic vulcanization accelerator aid, and a combination thereof, which is used in combination with the vulcanization accelerator to complete the promoting effect thereof .

As the inorganic vulcanization accelerating aid, any one selected from the group consisting of zinc oxide (ZnO), zinc carbonate, magnesium oxide (MgO), lead oxide, potassium hydroxide and combinations thereof may be used have. As the organic vulcanization accelerating auxiliary, there may be selected from the group consisting of stearic acid, zinc stearate, palmitic acid, linoleic acid, oleic acid, lauric acid, dibutyl ammonium oleate, derivatives thereof, Can be used.

In particular, the zinc oxide and the stearic acid may be used together as the vulcanization accelerating assistant. In this case, the zinc oxide is dissolved in the stearic acid to form an effective complex with the vulcanization accelerator, Thereby facilitating the crosslinking reaction of the rubber.

The vulcanization accelerator may be used in an amount of 1.5 to 8 parts by weight based on 100 parts by weight of the starting rubber to serve as a proper vulcanization accelerating auxiliary. When the zinc oxide and the stearic acid are used together, 1 to 5 parts by weight And 0.5 to 3 parts by weight of the stearic acid.

The rubber composition for a non-publicly-charged tire tread has excellent processability and may not contain a softening agent in rubber compounding, but may also include a softening agent commonly used in rubber for tires.

The softening agent may be added to the rubber composition to impart plasticity to the rubber to facilitate processing or to reduce the hardness of the vulcanized rubber. As the softening agent, any one selected from the group consisting of process oil other than the hydroxyl-terminated polybutadiene, plant oil, and combinations thereof may be used, but the present invention is not limited thereto.

As the processed oil, any one selected from the group consisting of paraffinic process oil, naphthenic process oil, aromatic process oil, and combinations thereof can be used.

However, recently, when the content of the polycyclic aromatic hydrocarbons (PAHs) contained in the aromatic process oil is 3 wt% or more together with the increase of environmental consciousness, it is known that it is highly likely to cause cancer. Wherein the total amount of the PAHs components is 3 wt% or less, the kinematic viscosity is 95 캜 or more (210 S SUS), the aromatic component in the softener is 15 to 25 wt%, the naphthene component is 27 to 50 wt% 37% by weight, and the paraffinic component is 38 to 58% by weight.

The processed oil has favorable properties for environmental factors such as low-temperature characteristics of the untreated tire tread including the processed oil, possibility of cancer induction of PAHs while improving the fuel consumption performance.

Examples of the vegetable oils include vegetable oils such as castor oil, cottonseed oil, linseed oil, canola oil, soybean oil, palm oil, palm oil, peanut oil, pine oil, pine tar, tall oil, cone oil, rice bran oil, safflower oil, sesame oil, , Jojoba oil, macadamia nut oil, four flower oil, tung oil, and combinations thereof.

The softening agent may be included in an amount of 0 to 50 parts by weight, and may be included in an amount of 20 to 40 parts by weight based on 100 parts by weight of the raw rubber to improve the workability of the raw rubber.

The antioxidant is an additive used to stop the chain reaction in which the tire is autoxidized by oxygen. As the anti-aging agent, any one selected from the group consisting of an amine type, a phenol type, an imidazole type, a carbamic acid metal salt and a combination thereof can be appropriately selected and used.

Examples of the antioxidant include N- (1,3-dimethylbutyl) -N-phenyl-p-phenylenediamine (6PPD), N- N-isopropyl-p-phenylenediamine (3PPD) and poly (2,2,4-trimethyl-1,2-dihydroquinoline (Poly , 4-trimethyl-1,2-dihydroquinoline, RD), and combinations thereof.

Considering the conditions such that the antioxidant should have high solubility in rubber, low volatility, inertness to rubber, and no inhibition of vulcanization, it is preferable that the antioxidant is used in an amount of 0 to 10 By weight.

A method of manufacturing a non-tired tire according to another embodiment of the present invention includes the steps of vulcanizing a rubber composition for a non-publicly-charged tire tread to produce a vulcanized rubber, applying an adhesive to the vulcanized rubber and bonding a urethane- .

The step of vulcanizing the rubber composition for a non-publicly-written tire tread to produce the vulcanized rubber may be any of those conventionally used. For example, the thermomechanical treatment or kneading of the blend at a maximum temperature of 110-190 ° C, preferably 130-180 ° C, followed by addition of a vulcanizing system, mixing and finishing, For example, at a low temperature of 40 to 100 占 폚.

The non-pouring tire can be manufactured by applying the adhesive to the vulcanized rubber and bonding the spokes made of the urethane material. In the case of the conventional method of manufacturing a non-publicly-written tire, the adhesive is infiltrated into the tread using an organic solvent when the adhesive is applied. However, in the case of using the rubber composition for a non-publicly-written tire tread, the adhesive can penetrate the tread well without using the organic solvent.

That is, the double bond of the hydroxyl-terminated polybutadiene is crosslinked with the double bond of the butadiene-based raw rubber, and the terminal hydroxyl group reacts with the NCO group which is the terminal group of the urethane to form a carbonate or a urea, Respectively. In order to achieve such chemical bonding, conventionally, an organic solvent is diluted with an adhesive and used to swell the rubber to allow the adhesive to penetrate into the tread. However, the method of manufacturing the non- The use of an organic solvent is unnecessary since the rubber itself contains the raw material for the adhesive including the processing oil as a raw material of the raw material.

Further, when the vulcanized rubber is thermally treated at 100 to 110 ° C for 3 to 5 hours and then applied with an adhesive, the penetration of the adhesive into the tread can be further improved. As a result, the adhesive force of the non-vulcanized tire tread and the spokes Can be further improved.

A non-tired tire according to another embodiment of the present invention can be manufactured according to the method of manufacturing the non-tired tire. The non-treadable tire may be a tread made of a rubber composition for a non-publicly-written tire tread, to which a urethane spoke is adhered.

The rubber composition for a non-publicly-applied tire tread of the present invention can greatly improve the adhesive force between the urethane rubber and the spokes.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

[ Manufacturing example : Preparation of rubber composition]

Using the compositions shown in Table 1 below, non-filled tire tread rubber compositions according to the following Examples and Comparative Examples were prepared. The production of the rubber composition was in accordance with the usual production method of the rubber composition.

Comparative Example 1 Comparative Example 2 Example 1 Example 2 Example 3 Example 4 Natural rubber 80 80 80 80 80 80 butadiene
Rubber 20 20 20 20 20 20 Silica ⁽¹⁾ 80 80 80 80 80 80 Coupling agent ⁽²⁾ 6.4 6.4 6.4 6.4 6.4 6.4 Oils for machine tools ⁽³⁾ 0 0 5 7 5 7 Zinc oxide 3 3 3 3 3 3 Stearic acid 2 2 2 2 2 2 Antioxidant 5 5 5 5 5 5

week)

(Unit: parts by weight)

(1) Silica: A precipitated silica having a BET specific surface area of 170 m ² / g

(2) Coupling agent: TESPT (Si69, Degussa)

(3) Processing oil: SR-45HT manufactured by Samyang Chemical Industry Co., Ltd., having a hydroxyl value of 44.9 to 56.1 mgKOH / g, a viscosity of 25 to 100 poise and a specific gravity of 25 to 40 To 0.9111, the number of functional groups of the hydroxyl group is 2.3 to 2.5, the content of water is 0.1% by weight or less, the content of peroxide is 500 or less, the content of nonvolatile matter is 99.90%

[ Experimental Example : Measurement of physical properties of the prepared rubber composition]

After applying the adhesive to the rubber specimens prepared in the above Examples and Comparative Examples, a urethane spoke was attached. The urethane used to make the spokes was VIBRATHANE B 836 from Chemtura, which was synthesized from polyether-based polyol and diphenylmethane diisocyanate (MDI) as raw materials and had a specific gravity of 1.02 to 1.09 , And NCO% was 3.0 to 10.6%.

In the case of Comparative Example 2 and Examples 3 and 4, the vulcanized rubber was heat-treated in an oven at 110 ° C for 4 hours prior to applying the adhesive to the vulcanized rubber. In Comparative Example 1, toluene was used as the organic solvent.

The adhesion of the tread and the spoke to the tire specimen was measured, and the results are shown in Table 2 below. At this time, the adhesive strength was measured by the method according to ASTM 6518.

Comparative Example 1 Comparative Example 2 Example 1 Example 2 Example 3 Example 4 Heat treatment X O X X O O Adhesive strength 3385 N / m 6738 N / m 4014 N / m 3588 N / m 8055 N / m 10494 N / m

Referring to Table 2 above, it can be seen that the bonding strength of Examples 1 and 2 prepared using the rubber composition for a non-publicly-written tire tread is higher than that of Comparative Example 1, And because the processed oil is uniformly distributed through the physical mixing to the rubber specimen, the cross-linking points between the raw rubber and the adhesive, the adhesive and the urethane spoke are increased, and the rubber is favorably adhered.

On the other hand, in Examples 3 and 4, it can be seen that the bonding strength is further improved by the heat treatment as compared with Examples 1 and 2.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

Claims (7)

100 parts by weight of the raw rubber,
10 to 100 parts by weight of a reinforcing filler, and
5 to 10 parts by weight of a processing oil containing hydroxy terminated polybutadiene (HTPB)
Lt; RTI ID = 0.0 > tread < / RTI > The method according to claim 1,
Wherein the hydroxyl group-terminated polybutadiene has a hydroxyl value of 44.9 to 56.1 mgKOH / g, a viscosity of 25 to 100 poise, a specific gravity of 25 to 40 C of 0.8911 to 0.9111, Wherein the functional group functionality is from 2.3 to 2.5. The method according to claim 1,
Wherein the hydroxyl-terminated polybutadiene has a water content of 0.1 wt% or less, a peroxide content of 500 ppm or less, and a nonvolatile matter content of 99.90 wt% or more. The method according to claim 1,
Wherein the reinforcing filler is a sedimentary silica having a BET specific surface area of 100 to 180 m ² / g and a DBP oil absorption of 180 to 200 cc / 100 g. Curing the rubber composition for a non-publicly-charged tire tread according to claim 1 to produce a vulcanized rubber, and
Applying an adhesive to the vulcanized rubber and bonding a spoke made of a urethane material to the vulcanized rubber. 6. The method of claim 5,
Wherein the method of manufacturing the non-tillable tire further comprises a step of heat-treating the vulcanized rubber at 100 to 110 ° C for 3 to 5 hours before the step of bonding the spokes. A non-publicly-added tire produced by the method of manufacturing a non-publicly-charged tire according to claim 5.