KR20190069169A - Silica tire composition comprising improved electrical conduction and heat conduction using a processing material-graphene - Google Patents

Abstract

The present invention relates to a composition for silica tire with improved electrical conductivity and thermal conductivity by applying graphene coated with processing aids and, more specifically to a composition for silica tire with improved electrical conductivity and thermal conductivity by applying graphene coated with processing aids, in which the unique characteristics of graphene and processing aids (UPA-300) are expressed without performance degradation even when the processing aids are mixed through a ′processing aid-coated graphene′ process to coat graphene with the processing aids, the dispersibility of graphene is improved, and accordingly, the effect of graphene is increased such that the effect of electrical conductivity and thermal conductivity is improved. According to the present invention, the composition includes styrene butadiene rubber (SBR), silica (SiO_2), stearic acid, graphene coated with processing aids, sulfur (S), zinc oxide (ZnO), and N-tert-butyl-benzothiazole sulfonamide (TBBS).

Description

Technical Field [0001] The present invention relates to a composition for silica tires having improved electrical conductivity and thermal conductivity including graphene coated with a processing aid,

The present invention relates to a composition for silica tires having improved electrical conductivity and thermal conductivity, including graphene coated with a processing aid.

Specifically, "graphene coated with a processing aid" having a processing aid coated on graphene exhibits inherent characteristics of a processing aid (UPA-300) and is also expressed without deteriorating the properties of graphene. Coated graphene has an effect of improving dispersibility and has an effect of improving electrical conductivity and thermal conductivity owing to the above effect, and provides a composition for silica tires including graphene coated with a processing aid.

The composition according to the present invention can be applied to a variety of substrates such as SBR (Styrene butadiene rubber), silica (SiO ₂ ), stearic acid, MATERIAL-GRAPHENE, S, TBBS (N-tert-butyl-2-benzothiazole sulfenamide).

Up to now, carbon black having high tensile strength, excellent rebound resilience and excellent dynamic properties has been used as a main filler of a rubber composition for tire tread.

However, in order to obtain excellent dynamic properties associated with low fuel consumption performance among various physical properties, silica is used instead of carbon black.

In addition, the use of silica on tire treads is increasing steadily as the development of low-emission tires accelerates due to today's diverse regulations for environmental protection.

On the other hand, because silica is very insulating, when a tire is made of rubber containing silica and the tire is mounted on a vehicle, static electricity generated in the vehicle is not released to the outside through the tire.

Such an electrical insulator accumulates static electricity induced by friction of the tire and the like without discharging it, thus giving rise to a risk of fire during the oil filling and an uncomfortable feeling during opening and closing of the door. Particularly, in the dry winter season, there is a problem of lowering the discharge performance due to low humidity in the atmosphere.

In general, when carbon black is applied to a tread, the discharge performance is not a problem because the volume resistivity is less than 10 ⁸ Ωcm. On the other hand, when silica is used in a high amount, it has a very high electric resistance of more than 10 ¹³ Ωcm, I can not show it at all.

Therefore, as a method for solving the above problem, a method of adding a metal powder having excellent electrical conductivity to a rubber composition using silica is introduced, but the metal material has a large specific gravity difference with respect to the polymer, There is a problem that occasionally occurs. In addition, it has a disadvantage in that the tensile property, the abrasion resistance and especially the tear strength are significantly lowered.

As another method, it is possible to use a conductive carbon black excellent in electrical conductivity in a rubber composition at a predetermined amount or more, to form an antistatic agent for suppressing the generation of static electricity, to constitute a part of the silica tread with a rubber composition filled with carbon black, The structure of the tire is often changed so as to emit static electricity.

However, even if the above method is used, there is a problem that the amount of silica used is increased, or when the entire filler is used only as silica, the effect of preventing the generation of static electricity is rapidly deteriorated and a large amount thereof is used.

Another alternative is to apply a recent CHIMMNEY structure. When manufacturing a static-dissipating tire using the CHIMMNEY structure, there is a disadvantage that a special mold must be manufactured when the structure of the tire is changed and extruded.

Finally, a method of improving electrical conductivity by applying single-wall and multi-walled carbon nanotubes to a tread has been introduced.

In the prior art, a tread composition having improved electrical conductivity by applying a composition (such as graphene in the present invention) having improved conduction characteristics such as carbon nanotubes having a low aspect ratio has been provided. However, in general, the compositions are blended with rubber to improve dispersibility A separate dispersant is contained together.

However, as the dispersing agent, which is a heterogeneous material, is mixed with the composition as described above, there is a problem that the physical properties such as fatigue breaking property, conductivity and strength inherent to the composition are deteriorated.

Accordingly, the present applicant has proposed a process for improving electric conductivity and thermal conductivity, which utilizes a processing aid added to a composition for silica tires in the past to express the properties of a processing aid and, at the same time, There is proposed a technique for use in a composition for silica tires, which comprises graphene coated with a processing aid that improves acidity.

As a related art, JP 10-1571666 describes a rubber composition for a tire tread.

The present invention relates to a rubber composition for a tire tread, and more particularly to a rubber composition for a tire tread, which contains silica treated with a graphene and a silane coupling agent as a filler to improve braking performance without deteriorating fuel consumption characteristics, To a rubber composition for a tire tread capable of realizing a luxurious color tone unique to graphene.

However, the above-mentioned technique uses a silane coupling agent that is commonly used as a silica dispersant, which is not a dispersion system for improving the dispersibility of graphene, and is different from the processing aid of the present invention. It is generally considered to be different.

That is, the technique does not treat graphene with a silane coupling agent, but rather treats silica with a silane coupling agent and then graphene.

Accordingly, it is impossible to know whether or not the above technique can solve the problem of deterioration due to the mixing of general heterogeneous materials when they are mixed by simply mixing graphene and a silane coupling agent serving as a dispersant.

In addition, the holding effect of the braking characteristics and the like provided as an effect in the above-described technique may be said to be different from the effect claimed by the present applicant.

In conclusion, even if a processing aid is used together to improve the dispersibility of graphene and graphene, both of the effects of both compositions, which basically improve the dispersibility of graphene and enable the inherent effect possessed by graphene Techniques related to techniques that have synergistic effects to be co-expressed have not been investigated.

Patent Registration No. 10-1571666 (Bulletin of 25th May 2015)

The object of the present invention is to provide a process for producing graphene which does not deteriorate the inherent properties of graphene and processing aid (UPA-300) even when the processing aid is mixed by using graphene coated with processing aid, Which has improved electrical conductivity and thermal conductivity, including graphene coated with a processing aid, which has an effect of improving the dispersibility of graphene coated with a processing aid and thereby improving electrical conductivity and thermal conductivity ≪ / RTI >

Still another object of the present invention is to provide a method of manufacturing a semiconductor device comprising the steps of: preparing a substrate made of SBR (Styrene butadiene rubber), silica (SiO ₂ ), stearic acid, MATERIAL- GRAPHENE, S, And TBBS (N-tert-butyl-benzothiazole sulfenamide), which has improved electrical conductivity and thermal conductivity, comprising graphene coated with a processing aid.

In order to achieve the above object, the composition for silica tires having improved electrical conductivity and thermal conductivity, including graphene coated with a processing aid according to the present invention, is effective for the electrical conductivity and thermal conductivity of graphene It is a feature of the present invention to provide a composition for silica tires in which the electrical conductivity and thermal conductivity of graphene are exhibited and the dispersibility of graphene is improved by coating a processing aid on the graphene in order to improve the dispersibility of the graphene .

Also disclosed is a composition for silica tires which effectively retains the electrical conductivity and thermal conductivity of graphene. In order to improve the dispersibility of the graphene, the graphenes are coated with a processing aid, The electrical conductivity and thermal conductivity of graphene are exhibited, and the dispersibility of graphene is improved.

Also, the composition for silica tires may be selected from the group consisting of SBR (Styrene butadiene rubber), silica (SiO ₂ ), stearic acid, MATERIAL-GRAPHENE, ZnO) and TBBS (N-tert-butyl-benzothiazole sulfenamide).

More specifically, the composition for silica tires may include 70 to 80 wt% of SBR (styrene butadiene rubber), 12 to 20 wt% of silica (SiO ₂ ), 0.7 to 1.2 wt% of stearic acid, 2.5 to 3.5 wt% of graphene, 1.5 to 2 wt% of sulfur, 1.7 to 2.5 wt% of zinc oxide and 0.7 to 1.3 wt% of N-tert-butyl-benzothiazole sulfenamide, .

Further, the graphene is a graphene made of an intercalation compound.

The graphene was dispersed in ethanol and then melted at a temperature of 80 ° C to mix the dissolving processing aid. The stirring was continued while the ethanol was being evaporated, and the ethanol was evaporated, Is provided in the form of being coated.

Further, the processing pellets are characterized by being a dispersant having a glyceride structure obtained by polymerizing a polyhydric alcohol having a glycerol structure and a fatty acid having 1 to 20 carbon atoms.

Also, the reaction temperature for the polymerization to have the glyceride structure of the processing aid is 160 to 220 캜, the reaction time is 2 to 6 hours, the stirring speed is 200 to 400 rpm, the glyceride structure And drying it.

Further, the glyceride structure of the processing aid is characterized in that glycerol is at least 50% by weight or more, and the remainder is fatty acid.

The composition for silica tires, which has improved electrical conductivity and thermal conductivity by applying graphene coated with a processing aid according to the present invention, includes SBR (styrene butadiene rubber, rubber), silica (SiO ₂ ), stearic acid, (S), zinc oxide (ZnO), and TBBS (N-tert-butyl-benzothiazole sulfenamide)

The processing assistant coating graphene was prepared by dispersing graphene in ethanol, dissolving at a temperature of 80 ° C to mix the dissolved processing aid, stirring the mixture while evaporating the ethanol, and evaporating the ethanol In this way,

Despite the use of both graphene and processing aids to improve its dispersibility,

The dispersibility of graphene is improved, the processing aid and the intrinsic properties of graphene are exhibited. As a result, the composition for silica tires including graphene coated with the processing aid has an effect of improving electrical conductivity and thermal conductivity do.

1 shows the results of evaluation of the mixing suitability of 'processing aid coating graphene' among compositions for silica tires having improved electrical conductivity and thermal conductivity by applying graphene coated with a processing aid according to the present invention.
FIG. 2 is a graph showing the results of evaluation of the suitability of graphene in 'machining aid coating graphene' of a composition for silica tires having improved electrical conductivity and thermal conductivity by applying graphene coated with a processing aid according to the present invention, The results of the evaluation are shown.
FIG. 3 shows the result of evaluation of the processing aid coating of 'processing aid coating graphene' in a composition for silica tires having improved electrical conductivity and thermal conductivity by applying graphene coated with processing aid according to the present invention by XRD technique .
FIG. 4 is a graph showing the results of evaluating the content of the processing aid of 'processing aid coating graphene' among compositions for silica tires having improved electrical conductivity and thermal conductivity by applying graphene coated with a processing aid according to the present invention.
FIG. 5 is a graph showing the results obtained when general processing aids are added when preparing 'processing assisted coating graphene' among compositions for silica tires having improved electrical conductivity and thermal conductivity by applying graphene coated with a processing aid according to the present invention, The results of the addition in the manner of the present invention are shown on the basis of modulus and tensile strength.
FIG. 6 is a graph showing the relationship between the addition of a processing aid in the preparation of the 'processing aid coating graphene' among compositions for silica tires having improved electrical conductivity and thermal conductivity by applying graphene coated with the processing aid according to the present invention, The results of the addition in the manner of the present invention are shown on the basis of thermal conductivity and electrical conductivity.
FIGS. 7 and 8 are graphs showing the results of evaluating the fatigue characteristics of a composition for silica tires having improved electrical conductivity and thermal conductivity by using graphene coated with a processing aid according to the present invention, The results are shown.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and the inventor can properly define the concept of the term to describe its invention in the best possible way And should be construed in accordance with the principles and meanings and concepts consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and drawings are only the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents And variations are possible.

Before describing the present invention with reference to the accompanying drawings, it should be noted that the present invention is not described or specifically described with respect to a known configuration that can be easily added by a person skilled in the art, Let the sound be revealed.

Example  1. Composition for silica tires improved in electrical conductivity and thermal conductivity by applying graphene coated with processing aid

The present invention relates to a composition for silica tires in which electrical conductivity and thermal conductivity are improved by applying graphene coated with a processing aid.

In the related art of silica tires, a silica dispersant may be used and graphene may be added to ensure the dispersibility of silica.

On the other hand, the composition according to the present invention can improve the electrical conductivity and thermal conductivity of a final silica tire workpiece (particularly, a tire) by applying 'processing aid coating graphene' prepared by coating a processing aid to graphene .

The composition for silica tires having improved electrical conductivity and thermal conductivity by applying the graphene coated with the processing aid according to the present invention is characterized in that SBR (styrene butadiene rubber, rubber), silica (SiO2), stearic acid, (S), zinc oxide (ZnO) and TBBS (N-tert-butyl-benzothiazole sulfenamide).

Depending on the design conditions, graphene may be replaced with carbon nanotubes (CNT), or graphene and CNT may be simultaneously applied at a ratio of 1: 1.

Specifically, it is preferable that 70 to 80% by weight of styrene butadiene rubber (SBR), 12 to 20% by weight of silica (SiO2), 0.7 to 1.2% by weight of stearic acid, and MATERIAL- GRAPHENE, 2.5 to 3.5% by weight of sulfur, 1.5 to 2% by weight of sulfur, 1.7 to 2.5% by weight of zinc oxide (ZnO) and 0.7 to 1.3% by weight of TBBS (N-tert-butyl-benzothiazole sulfenamide).

The graphene used in the processing aid coating graphene is graphene which is made of a conventional intercalation compound. The processing aid used is the following, and the remaining composition is purchased and used on the market.

That is, graphene is produced by the interlayer compound method, which uses graphene and other graphene produced by conventional acid treatment.

Interlayer Compound Method Graphene is a graphite derivative in which a guest molecule enters a hole of a layered crystal of graphite as a host or a guest molecule in the middle of the layer to form a compound, which is peeled from various solvents to produce high quality graphene.

Here, regarding the retention efficiency of graphene,

Graphene is a material with a honeycomb structure of atomic size made of carbon atoms.

It is called graphite because it is made from graphite as raw material.

Such graphene is the most excellent material among the existing materials. Thinner is 0.34nm in thickness and has high transparency. It can deliver 100 times more current than copper at room temperature, 100 times faster than silicon. In addition, the thermal conductivity is twice as high as the highest diamond.

In addition, the mechanical strength is more than 200 times stronger than steel, but it is stretchable, so that it does not lose its electrical conductivity even when stretched or folded. Due to these superior characteristics, it is attracting attention as a future technology.

Processing aid The preparation of the coated graphene was carried out by dissolving the processing aid (UPA-300) at a temperature of 75 to 85 캜 (preferably 80 캜) and dispersing the graphene in ethanol, ) Is mixed and the ethanol is evaporated while the stirring is continued, and finally the ethanol is evaporated is used as the processing-assistant coating graphene (MATERIAL-GRAPHENE).

In this case, it was confirmed that when ethanol was melted at a temperature of less than 75 ° C., the ethanol containing graphene dispersed was not properly mixed with the processing aid. When the temperature exceeded 85 ° C., It was confirmed that the effect of the 'processing aid coating graphene' was not obtained as the experimental results described below, and thus it did not have both the dispersibility and the effect of graphene.

Particularly, considering the melting point of the processing aid (UPA-300), when the processing aid is melted at a temperature of 79 to 82 캜, the electric conductivity is not lowered on the basis of graphene in the experiment based on Fig. 6 And it was confirmed that when the processing aid was melted at a temperature of 80 ° C., the electrical conductivity increased to the extent that it differs from the reference sample. Therefore, in order to improve the effect of graphene, 80 < 0 > C being most preferred.

At this time, the processing aid (UPA-300) used is a dispersant having a glyceride structure by polymerizing a fatty acid having 1 to 20 carbon atoms in a polyhydric alcohol having a glycerol structure having three hydroxyl groups.

That is, the glycerol is at least 50% by weight or more, and if the glycerol content is 50% by weight, the fatty acid content is 50% by weight and the glycerol content is 55% by weight, and the fatty acid content is 45% by weight.

The dispersant may be at least one selected from the group consisting of glycerol extracted from at least one vegetable oil selected from the group consisting of palm oil, coconut oil, soybean oil, castor oil, , Lauric acid, myristic acid, palmitic acid, stearic acid, and oleic acid.

This processing aid (UPA-300) is shown in [Table 1].

The R1 is a fatty acid alkyl group having 1 to 20 carbon atoms. Finally, the basic structure of the formula of UPA-300, a processing aid according to the present invention, is a glyceride structure formed by polymerization of glycerol extracted from vegetable oil with a fatty acid.

In this case, the glyceride structure (Monoglyceride) is obtained by polymerizing glycerol with a fatty acid as shown in Table 1, wherein the polymerization reaction temperature is from 160 to 220 ° C and the reaction time is from 2 to 6 hours. The stirring speed for the polymerization is 200 to 400 rpm.

When stirring is completed under the above conditions, it is prepared by washing and drying. At this time, the washing can be performed by spraying water, and the glyceride structure finally has a pellet (powder) form, so that it is possible to employ a conventional method of washing and drying the same. A detailed description thereof will be omitted.

Generally, it is feared that the retention function is lowered when the heterogeneous materials are mixed, compared with the conventional single composition, and it is confirmed that when the processing assistant coating graphene is prepared by the above-described manufacturing method, there is no difference from the single composition.

This refers to the following experimental example.

Experimental Example  One. Grapina , Processing aid and processing aid coating Grapina  Comparative evaluation experiment

(Experimental Method)

Experiments were carried out with the composition (processing aid coating graphene) according to Example 1, and both the general graphene and the processing aid as powders.

The FT-IR was evaluated in the form of powder in the form of Raman, TGA (Ar atmosphere, 10 ° C per minute) and XRD (2 ° per minute from 5 ° to 60 °).

The modulus and tensile strength are expressed as the average of five specimens with instron, thermal conductivity is analyzed by laser flash method and electrical conductivity is analyzed by 4-point probe. Fatigue was analyzed with demattia.

(Experimental results) - Evaluation of mixing suitability of UPA-300 and graphene used as processing aid

An assessment of mixing suitability is given in Figure 1 of the accompanying drawings.

1 shows the results of evaluation of the mixing suitability of 'processing aid coating graphene' among compositions for silica tires having improved electrical conductivity and thermal conductivity by applying graphene coated with a processing aid according to the present invention.

Referring to Figure 1 of the accompanying drawings,

In the case of graphene shown in blue, the peaks of CH 3 and CO 3 groups are not present due to the absence of processing aid, and in the case of processing aids represented by red, Peak is shown to exist.

In the case of the processing assistant coating graphene (processing aid-graphene) to which the graphene and the processing aid were applied, it was confirmed that the peeling of the C-H and C-O groups was present, so that the coating of the processing aid was properly performed.

On the other hand, although not shown in FIG. 1, peaks of the C-H and C-O groups of the processing aid were not observed when the graphene and the processing aid were simply mixed as in the prior art.

In addition, in evaluating the mixing suitability as described above, it was evaluated whether the intrinsic properties of graphenes were retained in the " processing aid coating graphene ". This is illustrated in Figure 2 of the accompanying drawings.

FIG. 2 is a graph showing the results of evaluation of the suitability of graphene in 'machining aid coating graphene' of a composition for silica tires having improved electrical conductivity and thermal conductivity by applying graphene coated with a processing aid according to the present invention, The results of the evaluation are shown.

FIG. 2 of the accompanying drawings shows the results of Raman. Referring to FIG. 2, it can be seen that graphene's intrinsic characteristics are maintained as the graphene peaks are maintained in the case of the 'processing aid graft coating grains'.

In FIG. 2, the first peak from the left side indicates the degree of defect (defect) of the D-band (peak) graphene, and the lower the first peak, the higher the defect quality.

The second peak is the intrinsic peak of all graphenes with the G-peak and the graphite intrinsic peak. The third peak is the 2D-peak, which means various characteristics (layer number, doping) of graphene.

These results show that the three peaks of the red graphene and the three peaks of the processing aid graphene retain the characteristics of the graphene.

In particular, it can be seen that the number of layers of graphene coated through 2D-peaks is one layer of graphene.

Also, referring to FIG. 3 based on the results of XRD, it can be seen that the processing aid coating of the 'processing aid coating graphene' is properly applied to the graphene.

FIG. 3 shows the result of evaluation of the processing aid coating of 'processing aid coating graphene' in a composition for silica tires having improved electrical conductivity and thermal conductivity by applying graphene coated with processing aid according to the present invention by XRD technique .

Referring to FIG. 3, it can be seen that the intrinsic peak exists at 26.4 ° in the case of graphene, and the intrinsic peak exists in the vicinity of 19 to 25 ° in the case of the processing aid. In the case of the processing aid coating graphene, By including both the preparation and the intrinsic peak of graphene, it was found that the coating was well formed to retain the unique properties of the processing aid and graphene.

As described above, the mixing of the graphene with the processing aid to effectively mix the properties of the graphene and the processing aid is influenced by the use of the mixing method according to the present invention. However, the content of graphene and the processing aid .

Therefore, an experiment to confirm the content of the processing aid contained in the processing aid-coated graphene according to the present invention was performed, and the result can be referred to FIG.

(Experimental results) - Content of the processing aid contained in the processing assistant coating graphene

FIG. 4 is a graph showing the results of evaluating the content of the processing aid of 'processing aid coating graphene' among compositions for silica tires having improved electrical conductivity and thermal conductivity by applying graphene coated with a processing aid according to the present invention.

4, graphite as a main raw material of graphene is not decomposed in the range of 0 to 800 ° (see black in FIG. 4), while processing aid is 400 Deg.] (See red in Fig. 4).

Based on these results, referring to the blue color of FIG. 4, the amount of decomposition at a temperature of 400 ° was 58% in the case of the 'processing aid coating graphene'.

Based on this, it can be seen that the 'processing aid coating graphene' consists of 58% by weight of the processing aid and 42% by weight of graphene.

Accordingly, the final content of the 'processing aid coating graphene' in the composition for silica tires having improved electrical conductivity and thermal conductivity by applying the graphene coated with the processing aid according to the present invention was 58 wt% By weight.

(Experimental results) - Evaluation results of modulus and tensile strength according to the application method of processing aid

FIG. 5 is a graph showing the results obtained when general processing aids are added when preparing 'processing assisted coating graphene' among compositions for silica tires having improved electrical conductivity and thermal conductivity by applying graphene coated with a processing aid according to the present invention, The result of the difference in addition according to the method of the present invention is shown based on the modulus and tensile strength.

Referring to FIG. 5 of the accompanying drawings, it has been found that tensile strength and modulus are decreased by adding carbon black as a processing aid to graphene in a conventional manner (reference sample). Particularly, it was confirmed that the modulus decreased sharply.

However, when the processing aid is applied to the graphene in the manner of the present invention, it was confirmed that the tensile strength was not lowered as compared with the conventional sample, and in particular, in the modulus aspect, it was confirmed that no sharp decrease was observed as compared with the conventional sample.

(Experimental method) - Evaluation of thermal conductivity and electrical conductivity according to application method of processing aid

FIG. 6 is a graph showing the relationship between the addition of a processing aid in the preparation of the 'processing aid coating graphene' among compositions for silica tires having improved electrical conductivity and thermal conductivity by applying graphene coated with the processing aid according to the present invention, The result of the difference in addition according to the method of the present invention is shown based on the thermal conductivity and the electric conductivity.

Referring to FIG. 6 of the accompanying drawings, it has been found that a reference sample to which a processing aid is added to graphene by a general method has lower thermal conductivity and electrical conductivity than graphene.

On the other hand, 'machining aid coating graphene' coated with a processing aid on graphene by the method according to the present invention showed a drastic improvement in thermal conductivity and improved electric conductivity.

(Experimental results) - Evaluation results of fatigue characteristics

FIGS. 7 and 8 are graphs showing the results of evaluating the fatigue characteristics of a composition for silica tires having improved electrical conductivity and thermal conductivity by using graphene coated with a processing aid according to the present invention, The results are shown.

Referring to Figures 7 and 8 of the accompanying drawings,

It was found that the fatigue characteristics of the reference sample in which the dispersant and the graphene were mixed in the conventional manner and the 'fatigue characteristics of the processing aid coating graphene (processing aid-graphene)' were improved compared with pure graphene,

Particularly, the fatigue characteristics of the 'processing aid graft coating graphene (grafting processing-graphene)' appear at a level which is significantly higher than that of the reference sample, so that even if the mixing method of the grafting aid and the grafting agent .

On the other hand, the silica tire workpiece by the above-mentioned composition means, in particular, a tire which includes all of tires for passenger cars, tires for trucks and buses, and the meaning of the workpiece is not necessarily limited to tires.

It is obvious that the present invention is not limited to the structure of the drawings, as it is possible to design variously within the technical scope of the present invention.

Claims (9)

A composition for silica tires which effectively retains electrical conductivity and thermal conductivity of graphene,
Characterized in that the processing aid is coated on the graphene in order to improve the dispersibility of the graphene so that the electrical conductivity and thermal conductivity of the graphene are exhibited and the dispersibility of the graphene is improved. A composition for a silica tire having improved electrical conductivity and thermal conductivity, comprising graphene as an effective component.
A composition for silica tires which effectively retains electrical conductivity and thermal conductivity of graphene,
By coating the graphene with a processing aid to improve the dispersibility of the graphene, the physical properties of the graphene and the processing aid are exhibited, the electrical conductivity and thermal conductivity of the graphene are exhibited, and the dispersibility of the graphene is improved Wherein the composition has improved electrical conductivity and thermal conductivity including graphene coated with a processing aid as an active ingredient.
The method according to claim 1 or 2,
In the composition for silica tires,
SBR (Styrene Butadiene Rubber), Silica (SiO2), Stearic Acid, MATERIAL-GRAPHENE, S, Zinc Oxide and TBBS (N-tert-butyl-benzothiazole wherein the composition is graphene coated with a processing aid, wherein the graphene-coated graphene is sulfenamide.
The method of claim 3,
In the composition for silica tires,
A stearic acid, a stearic acid, and a MATERIAL-GRAPHENE in an amount of 70 to 80 wt%, SBR (styrene butadiene rubber), 12 to 20 wt% of silica (SiO ₂ ), and 0.7 to 1.2 wt% , 1.5 to 2 wt% of sulfur (S), 1.7 to 2.5 wt% of zinc oxide (ZnO) and 0.7 to 1.3 wt% of TBBS (N-tert-butyl-benzothiazole sulfenamide) A composition for a silica tire having improved electrical conductivity and thermal conductivity comprising a pin as an active ingredient.
The method of claim 3,
Wherein the graphene is graphene made of an intercalation compound, wherein the graphene is a graphene coated with a processing aid and has improved electrical conductivity and thermal conductivity.
The method according to claim 1 or 2,
The graphene
And dispersed in ethanol, and then melted at a temperature of 80 ° C to mix the dissolved processing aid. The ethanol is evaporated while being stirred, and the ethanol is evaporated, whereby the processing aid is coated By weight based on the total weight of the composition. The composition for silica tires has improved electrical conductivity and thermal conductivity including graphene coated with a processing aid as an active ingredient.
The method of claim 6,
Characterized in that the processing aid is a dispersant having a polyhydric alcohol having a glycerol structure and a fatty acid-polymerized glyceride structure having 1 to 20 carbon atoms and having improved electrical conductivity and thermal conductivity including graphene coated with a processing aid as an active ingredient Composition for silica tires.
The method of claim 7,
The reaction temperature for the polymerization to have the glyceride structure of the processing aid is from 160 to 220 캜, the reaction time is from 2 to 6 hours, the stirring speed is from 200 to 400 rpm,
A composition for silica tires having improved electrical conductivity and thermal conductivity comprising graphene coated with a processing aid as an active ingredient, characterized in that the stirring is completed by washing and drying the glyceride structure.
The method of claim 7,
As the glyceride structure of the processing aid,
A composition for silica tires having improved electrical conductivity and thermal conductivity comprising graphene coated with a processing aid as an active ingredient, characterized in that glycerol is at least 50 wt% and the remainder is fatty acid.

Images