KR101661156B1

KR101661156B1 - Tire tread rubber composition having graphene foam and rubber complexes and tire comprising the Same

Info

Publication number: KR101661156B1
Application number: KR1020150046776A
Authority: KR
Inventors: 박진주
Original assignee: 금호타이어 주식회사
Priority date: 2015-04-02
Filing date: 2015-04-02
Publication date: 2016-09-30

Abstract

The present invention discloses rubber compositions for tire treads.
The rubber composition for a tire tread according to the present invention is characterized by comprising 10 to 50 parts by weight of a carbon foam as a filler with respect to 100 parts by weight of the raw rubber. In this case, the pore space of the carbon foam having micropores Mechanical properties and electrical conductivity can be improved by the physical entanglement structure formed during the penetration.

Description

Technical Field [0001] The present invention relates to a tread composition employing a carbon foam and a rubber composite, and a tire comprising the same,

TECHNICAL FIELD The present invention relates to a tread composition to which a carbon foam and a rubber composite are applied and a tire comprising the same. More particularly, the present invention relates to a tread composition having a mechanical pore structure formed by a physical entanglement structure formed by penetration of a rubber molecular chain into a pore space of a carbon foam having micropores A tread composition to which a carbon foam and a rubber composite improved in physical properties and electrical conductivity are applied, and tires comprising the same.

Background Art [0002] Conventional tires serve to support the load of an automobile, mitigate the impact from the road surface, and transmit the driving force or braking force of the automobile to the ground. Such tires may structurally include fibers and steel cords according to requirements.

Carbon black is mainly used as a main filler in the production of rubber compositions for tire treads.

As disclosed in Korean Patent Publication No. 20130029523, such a rubber composition filled with carbon black has high tensile strength, excellent rebound resilience, and excellent dynamic characteristics.

However, since the bonding force is maintained only by a very weak Van der Waals force between the carbon black surface and the rubber, the performance of the tire is inevitably accompanied by a decrease in fuel consumption performance due to heat generation during tire driving.

Nowadays, as the development of low-emission tires accelerates due to various regulations for protecting the global environment, the case of applying silica in tire treads is increasing. As in Korean Patent Publication No. 20110073067, even when such silica is applied The silica is not uniformly dispersed in the rubber composition due to the tendency of the silica particles to coagulate with each other, and clusters are formed, thereby causing problems such that the defects are mass-produced.

Accordingly, a first technical problem to be solved by the present invention is to provide a rubber composition which is improved in mechanical properties and electrical conductivity by a physical entanglement structure formed by penetration of a rubber molecular chain into a pore space of a carbon foam having micropores, Tread composition.

Another object of the present invention is to provide a rubber composition which is improved in mechanical properties and electrical conductivity by a physical entanglement structure formed by penetration of a rubber molecular chain into a pore space of a carbon foam having micropores, Tread composition according to the present invention.

The present invention provides a rubber composition for a tire tread, which comprises a carbon foam as a filler for a raw rubber, in order to solve the above-mentioned technical problems.

According to an embodiment of the present invention, the carbon foam may be carbonized by impregnating the carbon precursor mixture solution with the polyurethane foam as a template.

According to another embodiment of the present invention, the carbon precursor mixed solution may be a resorcinol-formaldehyde mixed solution, a phenol-formaldehyde mixed solution, or a phenol-resorcinol-formaldehyde mixed solution.

According to another aspect of the present invention, there is provided a tire including the rubber composition for a tire tread.

According to the tread composition and the tire including the carbon foam-rubber composite according to the present invention, the physical entanglement structure formed by penetration of the rubber molecular chain into the pore space of the carbon foam having the micropores, .

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

It is to be noted that the technical terms used in the present invention are used only to describe specific embodiments and are not intended to limit the present invention, and the technical terms used in the present invention are defined in the present invention in a different sense It is to be understood that the present invention should not be construed in an overly broad sense or in an excessively reduced sense by a person having ordinary skill in the art to which the present invention belongs.

In addition, when a technical term used in the present invention is an erroneous technical term that does not accurately express the concept of the present invention, it should be understood that technical terms can be understood by those skilled in the art. In addition, the general terms used in the present invention should be interpreted according to a predefined or prior context, and should not be construed as being excessively reduced.

In addition, the singular forms "a", "an," and "the" include plural referents unless the context clearly dictates otherwise. For example, the terms "comprise" It is to be understood that the various steps need not necessarily be construed as encompassing all, some of the elements or portions of the steps may not be included, or may include additional elements or steps.

The rubber composition for a tire tread according to the present invention includes a raw rubber and a carbon foam as a filler. The carbon foam has electrical conductivity that can be used as an electrostatic discharge path required by a vehicle, has a low volume to volume ratio, Or a mechanical property can be exhibited.

The raw material rubber may be natural rubber or synthetic rubber, and may be used in accordance with the specification of the tire. Specifically, SBR rubber or SBR rubber and butyl rubber may be mixed and used.

The carbon foam may have micropores (having a pore diameter of 1 to 1000 탆), and the polyurethane foam may be used as a template to be impregnated with the carbon precursor mixture solution, followed by carbonization.

As the carbon precursor mixture solution, a mixed solution containing resorcinol and formaldehyde, a mixed solution containing phenol and formaldehyde, or a mixed solution containing phenol, resorcinol, and formaldehyde may be used.

The polyurethane foam may be soft, hard or semi-rigid. The template may be provided with a plurality of pores by a foaming process. The mixed solution of the carbon precursor may penetrate the pores and may be applied to the surface and the inner wall of the pores. Can be prepared.

Carbonization is carried out by experiencing such macro carbon foam in an inert atmosphere at 700 to 1200 ° C, and the carbon foam is cured while the macro carbon foam is cured and the pore structure is maintained.

The carbon foam may be used in an amount of 10 to 50 parts by weight based on 100 parts by weight of the raw rubber. If the carbon foam is added in an amount of less than 10 parts by weight, improvement in physical properties of the rubber composition may be insignificant. The dispersibility may be lowered.

In addition, the present invention can produce tires including conventional tire additives such as fillers, coupling agents, zincation, stearic acid, antioxidants, waxes, process oils, sulfur or accelerators.

Production Example 1

A macro carbon foam was prepared by impregnating a mixture of resorcinol-formaldehyde as a template and a carbon precursor with a radial-quality polyurethane foam to form a macro carbon foam. The carbon foam was then cured and carbonized at 830 ° C in an inert atmosphere of nitrogen and argon Respectively.

Production Example 2

Carbon foam was prepared in the same manner as in Preparation Example 1 except that phenol-formaldehyde was used as a carbon precursor.

Production Example 3

The carbon foam was prepared in the same manner as in Preparation Example 1 except that phenol-resorcinol-formaldehyde was used as the carbon precursor.

Examples 1 to 3

Rubber specimens vulcanized at 160 ° C in the compositions shown in Table 1 were prepared using the carbon foam according to Production Examples 1 to 3, and physical properties of the rubber specimens were measured according to ASTM regulations. Are shown in Tables 2 and 3 below.

Comparative Example

70 parts by weight of carbon black was used with respect to 100 parts by weight of the SBR rubber, and rubber specimens vulcanized at 160 DEG C in the compositions shown in Table 1 were prepared. The rubber specimens were measured for physical properties according to ASTM regulations, The results are shown in Tables 2 and 3 below.

Comparative Example Example 1 Example 2 Example 3 SBR rubber 100 100 100 100 Carbon foam 0 10 30 50 Carbon black 70 40 20 0 Zinc oxide 3 3 3 3 Stearic acid 2 2 2 2 Antioxidant 2 2 2 2 sulfur 2 2 2 2 Vulcanization accelerator One One One One

Example 1 Example 2 Example 3 Comparative Example Heat Build Up 21 18 15 29 Comp. SET (%) 96 97 96 97

As shown in Table 1, Examples 1 to 3 of the present invention can be confirmed to have excellent heat generating characteristics as compared with Comparative Examples.

Psalter Hard's ¹⁾ Modulus-
50% kg / cm2 Modulus-
100% kg / cm2 Modulus-
300% kg / cm2 TS ²⁾ EB ³⁾ Example 1 69 14 28 128 245 482 Example 2 70 13 27 126 255 445 Example 3 70 13 27 120 264 449 Comparative Example 69 15 30 130 230 420

week)

1) Hard's (hardness): Indicates hardness and softness. The higher the value, the stronger the hardness.

2) T.S (Tensile Strength): Strength at breaking point when a specimen of a certain size and thickness is extended in the longitudinal direction. The higher the value, the stronger the force is required to break.

3) E.B (Elongation at Break): Elongation at break means the length of the specimen with a certain size and thickness when stretched in the longitudinal direction. The higher the value, the greater the length of the rupture.

As shown in Table 2, it can be seen that Examples 1 to 3 of the present invention have improved tensile strength and elongation percentage as compared with Comparative Examples.

Claims

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The raw rubber contains carbon foam as a filler,
The carbon foam is obtained by impregnating a polyurethane foam as a template into a carbon precursor mixture solution and carbonizing the mixture at 700 to 1200 ° C in an inert atmosphere,
Wherein the carbon precursor mixture solution is a phenol-formaldehyde mixed solution.

A tire comprising the rubber composition for a tire tread according to claim 3.