KR20200040442A - Tread rubber composition for improved wet-ice performance and tyre thereof - Google Patents

Abstract

The present invention discloses a tread rubber composition having improved driving performance on wet roads, and a tire thereof. In the tread rubber composition having improved driving performance on wet roads and a tire thereof according to the present invention, the tread rubber composition contains activated carbon, wherein the activated carbon is impregnated with flavonoids which are injected into pores thereof. Accordingly, the present invention can exert the effect of improving the braking performance of the tire on the wet road surface while maintaining the wear resistance and tensile properties of the tread rubber.

Description

Tread rubber composition for improved wet-ice performance and tire thereof

The present invention relates to a tread rubber composition having improved wet road runability and a tire thereof, and more particularly, a tread rubber with improved wet road runability that improves braking performance on a wet road surface while maintaining wear resistance and tensile properties of the tread rubber. It relates to a composition.

With the recent increase in high-speed driving, as the interest in vehicle safety increases, there is an increasing demand for improved braking performance on wet or wet snowy surfaces, and for example, dispersing activated carbon, which has a very fine structure. By doing so, braking performance was improved.

These activated carbons are black porous carbon materials with numerous capillaries, form an amorphous carbon arrangement, and the pores of activated carbon have air pores directly involved in adsorption and strength pores closely related to adsorption capacity. Physical adsorption is formed.

This adsorption force is mainly van der Walls force (Van der Walls force) acts, and unsaturated carbon or oxygen and a rubber polymer (Polymer) physical adsorption or weak chemical bonds are dispersed.

It has excellent dispersing power of powdered activated carbon and has less scattering when using granular activated carbon, and has excellent processability, and activated carbon has increased molecular weight and increased adsorption, resulting in increased miscibility with rubber, braking performance on tire wet surfaces or snowy roads. In order to increase, the commonly applied method is a technique to change the polymer base to increase the transition temperature (Tg) or to increase the silica surface area, but this is due to the difficulty of the process due to the polymer modification and the silica surface area increase. It takes process equipment or time, and there is a limit in improving braking performance due to a large drop in rubber properties compared to improving braking performance.

In addition, these prior arts have limitations in their application and performance by adopting a method of controlling only the particle diameter of activated carbon, and when flavonoids are used alone, it is difficult to input and disperse and carbonization occurs during the process.

On the other hand, in order to improve the conventional wet surface braking performance, there is a technique using silica having a low specific surface area or using aluminum hydroxide with a high degree of non-uniformity (Public Patent Publication JP-255814), but this technique is made of aluminum. There was a problem in that the structure was deformed at a high temperature (185 ° C.) or higher in the vulcanization process of the tire rubber composition without considering the particle uniformity of the hydroxide oxide powder.

Accordingly, a technical problem to be solved by the present invention is to provide a tread rubber composition and a tire having improved wet road driving performance that improve braking performance on a wet road surface while maintaining wear resistance and tensile properties of the tread rubber.

In order to solve the above technical problem, the present invention provides a tread rubber composition having improved wet surface driving properties, wherein in the tread rubber composition containing activated carbon, the activated carbon is impregnated with flavonoids and injected into the pores.

According to an embodiment of the present invention, the flavonoid may use 5 parts by weight or more based on 100 parts by weight of activated carbon.

According to another embodiment of the present invention, the flavonoids are chrysin, galagin, acacetin, quercetin, camperol, or hydroxy group, ketone It may include a plant flavonoid having a group (Keton group) or a phenyl group (phenyl group).

On the other hand, the present invention provides a tire comprising the above-described tread rubber composition.

According to the present invention, while maintaining the wear resistance and tensile properties of the tread rubber of the tire, there is an effect of improving the braking performance on the wet road surface of the tire.

1 and 2 are microscopic photographs of tread rubber specimens prepared according to Example 1 and Comparative Example 1, respectively, obtained by evaluating abrasion, and taking cross-sections.

The examples described below are necessary contents for explaining the present invention, and the present invention should not be interpreted to be limited thereby, and the present invention is within a range that can be easily modified, substituted, or changed by a person skilled in the art. Will be self-evident.

The tread rubber composition having improved wet road driving performance according to the present invention is characterized in that in the tread rubber composition containing activated carbon, the activated carbon is impregnated with flavonoids and injected into the pores.

The activated carbon has a high electron density between the atmospheric pores when the pore size is between 1000 and 10000 nm, thereby increasing the adsorption power with polar flavonoids and rubber, and having an excellent water film removal effect, and the adsorption power with flavonoids and rubber is mainly van der Waals force. This action, and hydroxy group, ketone group, unsaturated carbon or oxygen and a rubber polymer and the physical adsorption or weak chemical bonds are dispersed.

In addition, the strength hole of the activated carbon exerts an effect of removing VOCs and odors of flavonoid impurities and rubber, and the strength hole can impregnate flavonoids and remove VOCs and odors of flavonoid impurities during mixing and remove hydroxy groups In the case of a large amount of flavonoids, it is selectively discharged by combining with a silica coupling agent, thereby exhibiting the effect of improving the polar group on the tread surface.

Therefore, when the activated carbon is added, the activated carbon remaining after the silanization reaction of the flavonoid and the silane increases the tread rubber micropore countlessly to increase the tread ground surface, and water or snow is absorbed into the micropore and the flavonoid Since the hydroxy group reduces the tread surface tension, it is possible to increase the frictional force with the ground.

If the activated carbon has a molecular weight of 700 or more, the adsorption rate is greatly reduced, the amount of adsorption is reduced, and the abrasion performance may be significantly reduced. Therefore, it is preferable to use an activated carbon powder having a molecular weight of 700 or less, that is, an average particle size of 150 μm or less, if it exceeds 150 μm. If it is, the impregnation of the flavonoids is difficult and the abrasion performance may drop rapidly, and the specific surface area of the activated carbon is preferably 400 or more of I ₂ No. (iodine adsorption value (ASTM D1510)), and the adsorption performance of activated carbon is significantly superior to that of carbon black. .

The activated carbon is impregnated with flavonoids, used as granular or powdered flavonoid activated carbon, and may be used in an amount of 2 to 20 parts by weight based on 100 parts by weight of tread rubber. If less than 2 parts by weight is added, braking performance on wet roads or snowy roads The improvement effect may be insignificant and, conversely, if it exceeds 20 parts by weight, the tread rubber properties and wear performance may drop sharply.

In addition, in the granular or powdered flavonoid activated carbon, flavonoids may be used in an amount of 5 parts by weight or more with respect to 100 parts by weight of activated carbon. When less than 5 parts by weight, the performance of flavonoids may be negligible by reacting without residual amount of carbon black and silica active groups. .

In addition, the content of the water contained in or adsorbed to the flavonoid activated carbon is preferably 5% by weight or less compared to the flavonoid activated carbon, and when it exceeds 5% by weight, silica-silane reversible reaction occurs in the silica compound to degrade the performance of the silica compound and dispersibility of the activated carbon This can fall.

In addition, the flavonoids may include chrysin, crackin, acacetin, quercetin, or kempferol, or hydroxy groups, ketone groups Keton group) or a phenyl group (phenyl group) may include a plant flavonoid.

Meanwhile, the present invention may disclose a tire using a tread rubber with the above-described tread rubber composition, and the tire may be a vehicle tire.

<Examples and Comparative Examples>

With the compounding composition of Table 1 below, the powdered activated carbon impregnated with flavonoids was mixed and extruded to perform the tire tread rubber of the present invention, and a comparative example prepared by exemplifying the prior art was prepared.

Item Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Example 1 Example 2 Raw rubber
(SSBR / BR) 70/30 70/30 70/30 7/30 70/30 70/30 70/30 70/30 Silica (reinforcing material) 80 80 80 80 80 80 80 80 Silane 8 8 8 8 8 8 8 8 Carbon black 10 10 10 10 10 10 10 10 Process preparation 2 2 2 2 2 2 2 2 Activated carbon 10 10 Flavonoids 2 Flavonoids
Activated carbon One 25 10 15 Stearic acid 2 2 2 2 2 2 2 2 Anti-aging agent 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 Boom 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 Curing accelerator 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5

* Silica: specific surface area of about 115 m ² / g

* Process preparation: Zinc-free fatty acid esters and soap.

* Comparative Example 2: Quercetin alone 2 parts by weight added

* Comparative Example 3: Average diameter 200μm powder activated carbon applied

* Comparative Example 4: Average diameter of 100μm powder activated carbon applied

* Example 1,2 flavonoid activated carbon: Quercetin impregnated activated carbon with a diameter of 100 μm

For each rubber specimen prepared in Table 1, the properties of Mooney viscosity, processability (MDR), tensile properties (Tensile), RTMS (μ-peak), dynamic viscoelasticity (DMA), and wear (DIN Abrasion) were measured. Measured according to ASTM related regulations and the results are summarized in Table 2 below.

Item Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Example 1 Example 2 Mooney viscosity MV @ 125 ℃ 61 74 81 62 62 57 58 58 T05 21 22 25 21 21 19 20 19 MV @ 100 ℃ 71 95 103 75 72 76 74 77 Braking power
(RTMS)
μ-peak
(Wet, Index) 100 102 103 104 101 121 111 117 μ-peak
(Ice, Index) 100 101 102 103 101 116 109 116 Tensile properties Hardness 56 59 60 57 56 61 58 59 M-300% 67 75 68 67 69 72 69 72 T.S 220 217 211 185 222 169 176 181 E.B 657 623 619 625 644 506 609 612 DMA Tg -6.6 -7.0 -7.1 -7.2 -6.8 -6.9 -7.0 -6.5 Tand @ 0 ℃ 0.189 0.195 0.201 0.198 0.191 0.211 0.198 0.211 Tand @ 70 ℃ 0.108 0.127 0.138 0.112 0.112 0.127 0.119 0.123 E "@ 22 ℃ 1.29 1.52 0.160 1.71 1.33 1.92 1.79 1.83 Wear Loss (g) 0.113 0.129 0.136 0.121 0.114 0.124 0.113 0.114 Index 100 86 80 93 100 90 100 100

* μ: coefficient of friction (μ = F / W)

(F: static friction force (unit N), W: vertical drag force (unit N))

* μ-peak: u maximum value between the ground and compound slip ratio (%) between 0 and 30%

Referring to Table 2, it can be seen that the tire tread rubber according to Example 1 has a similar level of Mooney viscosity, processability, and abrasion performance compared to Comparative Example 1, and the Wet μ-peak value is improved by 17%. You can see that the value of -upeak improved by 16%.

In Comparative Examples 1 and 2, when Quercetin was added alone, the abrasion performance decreased due to an increase in viscosity and poor dispersion. As can be seen, when comparing Comparative Example 1 and Comparative Example 4, it can be seen that the braking force slightly increased when activated carbon was added alone.

In Comparative Example 5, when using less than 2 flavonoid activated carbon, it can be seen that the present level is the same level without the effect of improving performance.

In addition, FIGS. 1 and 2 are photographs taken by cross-sectioning of the tread rubber specimens according to Example 1 and Comparative Example 1 after abrasion evaluation, and referring to them, pores are generated on the road surface when activated carbon is applied and wet / ice surfaces It can be seen that the traction force in the escalator increases.

Claims (4)

In the tread rubber composition containing activated carbon,
The activated carbon is a tread rubber composition having improved wet road driving characteristics, characterized in that flavonoids are impregnated and injected into the pores.
According to claim 1,
The flavonoid is a tread rubber composition having improved wet road surface performance, characterized in that 5 parts by weight or more based on 100 parts by weight of activated carbon.
According to claim 2,
The flavonoids are chrysin, crackin, acacetin, quercetin, camperol, or hydroxy group, keton group or phenyl group (phenyl group). Group) tread rubber composition comprising improved plant flavonoids.
A tire comprising the tread rubber composition of claim 1.

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