KR20200036347A - Rubber reinforcing material, method of preparing the same and tire comprising the same - Google Patents

Abstract

The present invention relates to a rubber reinforcing material comprising a fiber substrate and a rubber coating layer on the fiber substrate, wherein the rubber coating layer is formed by a rubber coating solution, and the rubber coating solution comprises: rubber compound solids of 5 to 30 wt%; and a solvent of 70 to 95 wt% based on the total weight of the rubber coating solution.

Description

Rubber reinforcing material, manufacturing method thereof and tire including the same {RUBBER REINFORCING MATERIAL, METHOD OF PREPARING THE SAME AND TIRE COMPRISING THE SAME}

The present invention relates to a rubber reinforcing material capable of reducing the weight of a tire, a manufacturing method thereof, and a tire including such a rubber reinforcing material.

In recent years, in consideration of energy problems, fuel efficiency, and environmental problems, a tire that is lightweight and has excellent durability is required.

Tire cords are classified according to the parts and roles used, and can be largely divided into a carcass supporting the tire as a whole, a belt preventing load bearing and deformation due to high-speed driving, and a cap fly preventing deformation of the belt (FIG. 1). In particular, recently, studies on weight reduction of carcass have been conducted for weight reduction of automobiles and weight reduction of tires.

Belt, carcass, and capply materials include, for example, nylon, rayon, aramid, and polyester including PET. In addition, in order to compensate for the shortcomings of one type of fiber, a hybrid structured yarn having a mixture of two different types of fibers has been developed. As a hybrid yarn of such a hybrid structure, for example, there is a hybrid yarn of a hybrid structure including nylon and aramid. When such a pneumatic yarn is used, expansion problems and fatigue durability problems during tire manufacturing may be solved.

Tire cords made of fibers such as nylon, rayon, aramid, PET, polyester or hybrid plywood are usually rolled with a rubber component for adhesion to rubber. That is, a rolling process is involved in the tire manufacturing process. However, when the rolling process for the adhesion of the tire cord and the rubber is applied in the manufacturing process of the tire, the process cost increases, and the thickness of the reinforcing layer increases more than necessary due to rolling, so that the weight of the tire may increase unnecessarily. .

In the process of rolling rubber on a tire cord, solid rubber is generally used. Products formed by the rolling of such rubber are difficult to be made into a thin thin film of 200 µm or less, or 100 µm or less, especially 30 µm or less, and when these products are used as a reinforcing material, the thickness and weight of the tire increase.

On the other hand, recent tire manufacturers are trying to reduce the thickness of the rubber layer in order to make the tire lighter and lighter. Rolling Resistance (R / R) is related to the weight of the tire and has a significant effect on the fuel consumption and carbon dioxide emissions of the vehicle. For example, when the weight of the tire increases, rolling resistance (R / R) increases, energy required when driving the vehicle increases, and resistance to rotation, inclination, and acceleration of the vehicle may increase. Accordingly, research has been conducted to reduce the weight of automobiles through weight reduction of tires and, as a result, reduce energy consumption.

However, when the tire is lightweight, there may be a problem in the durability of the tire, and since the durability of the tire is directly related to the safety of the vehicle, there is a limit in reducing the weight of the tire.

The present invention is to solve the limitations and problems of the related art as described above.

One embodiment of the present invention is to provide a rubber reinforcement material having excellent adhesion to rubber even though the thickness is thin.

Another embodiment of the present invention is to provide a rubber reinforcing material capable of exerting excellent performance as a tire reinforcing material even when having a thin thickness and maintaining tire durability.

Another embodiment of the present invention, to provide a rubber reinforcement that can contribute to tire weight reduction. Another embodiment of the present invention, in particular, to provide a carcass that can contribute to the weight reduction of the tire.

Another embodiment of the present invention is to provide a rubber reinforcing material having excellent adhesion to rubber without undergoing a rolling process during the tire manufacturing process and having the same level of durability as a tire manufactured through rolling.

Another embodiment of the present invention is to provide a method for manufacturing such a rubber reinforcement and a tire including the rubber reinforcement.

Another embodiment of the present invention is to provide a lightweight tire.

In addition to the above-mentioned aspects of the present invention, other features and advantages of the present invention will be described below, or it will be clearly understood by those skilled in the art from the description.

To solve this problem, an embodiment of the present invention includes a fiber substrate and a rubber coating layer on the fiber substrate, the rubber coating layer is formed by a rubber coating solution, the rubber coating solution, the total weight of the rubber coating solution With respect to the present invention, a rubber reinforcement material is provided, comprising 5 to 30% by weight of rubber compound solids and 70 to 95% by weight of solvent.

The rubber coating layer has a thickness of 10 to 100 ㎛.

The rubber compound solid content includes at least one rubber component selected from natural rubber, styrene butadiene rubber, butadiene rubber, chloroprene rubber, isobutylene rubber, isoprene rubber, nitrile rubber, butyl rubber and neoprene rubber and carbon black.

The rubber compound solid content includes 50 to 78 parts by weight of the rubber component and 22 to 50 parts by weight of carbon black based on 100 parts by weight of the total weight.

The solvent includes at least one selected from toluene, naphtha, methanol, xylene, and tetrahydrofuran.

The rubber coating solution has a viscosity of 200 to 90,000 cP.

The fiber substrate is any one of a fiber yarn, a textile substrate and a cord.

The rubber reinforcement further includes an adhesive layer on the fiber substrate, and the rubber coating layer is disposed on the adhesive layer.

The adhesive layer includes resorcinol-formaldehyde-latex (RFL).

Another embodiment of the present invention comprises the steps of preparing a fiber substrate and applying a rubber coating solution on the fiber substrate and drying to form a rubber coating layer, wherein the rubber coating solution is based on the total weight of the rubber coating solution. , 5 to 30% by weight of a rubber compound solids and 70 to 95% by weight of a solvent, provides a method for producing a rubber reinforcement.

The rubber coating solution has a viscosity of 200 to 90,000 cP.

The rubber coating layer has a thickness of 10 to 100 ㎛.

The rubber compound solid content includes at least one rubber component selected from natural rubber, styrene butadiene rubber, butadiene rubber, chloroprene rubber, isobutylene rubber, isoprene rubber, nitrile rubber, butyl rubber and neoprene rubber and carbon black.

The rubber compound solid content includes 50 to 78 parts by weight of the rubber component and 22 to 50 parts by weight of carbon black based on 100 parts by weight of the total weight.

The solvent includes at least one selected from toluene, naphtha, methanol, xylene, and tetrahydrofuran.

The method of manufacturing the rubber reinforcing material further includes forming an adhesive layer on the fiber substrate before forming the rubber coating layer.

Another embodiment of the present invention provides a tire including the rubber reinforcement.

The general description of the present invention as described above is only for illustrating or describing the present invention, and does not limit the scope of the present invention.

Since the rubber reinforcing material according to an embodiment of the present invention has excellent adhesion to rubber, it can be strongly adhered to the rubber without going through a rolling process in the tire manufacturing process. According to the present invention, since the rubber reinforcing material adheres to the rubber without going through the rolling process, the tire manufacturing cost is reduced, and the thickness of the tire is increased more than necessary and the weight of the tire is unnecessarily increased due to rolling. Is prevented.

When the rubber reinforcement according to an embodiment of the present invention is applied to a tire, the manufacturing process of the tire may be simplified because the rolling process may be omitted, and the thickness and weight of the tire may be reduced. Further, the tire according to the present invention may have the same level of durability as a tire manufactured through a rolling process, even if it is manufactured without a rolling process.

Further, according to an embodiment of the present invention, it is possible to reduce the thickness of the rubber layer for ultra-light weight of the tire and light weight of the reinforcement material. According to the present invention, as the thin and light rubber reinforcement is used, the weight of the tire is reduced, the rolling resistance (R / R) is reduced, the fuel efficiency of the vehicle is improved, and the carbon dioxide emission can be lowered.

In particular, in the case of an electric vehicle using a battery, it is necessary to reduce the weight of the vehicle body to improve driving distance and fuel efficiency. According to one embodiment of the present invention, the weight of the tire is made, and the fuel efficiency and economic efficiency of the electric vehicle can be improved.

The accompanying drawings are intended to help the understanding of the present invention and constitute a part of the present specification, and exemplify embodiments of the present invention, and describe the principles of the present invention together with a detailed description of the present invention.
1 is a partial cutaway view of a tire according to an embodiment of the present invention.
2 is a schematic cross-sectional view of a rubber reinforcement according to another embodiment of the present invention.
3 is a schematic view of a plying yarn.
4 is a schematic cross-sectional view of a rubber reinforcement according to another embodiment of the present invention.
5 is a schematic cross-sectional view of a rubber reinforcement according to another embodiment of the present invention.
6 is a schematic cross-sectional view of a rubber reinforcement according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It will be apparent to those skilled in the art that various changes and modifications of the present invention are possible without departing from the spirit and scope of the present invention. Accordingly, the present invention includes all modifications and variations falling within the scope of the invention described in the claims and equivalents thereof.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings to illustrate embodiments of the present invention are exemplary, and the present invention is not limited by the details shown in the drawings. Throughout the specification, the same components may be referred to by the same reference numerals.

When 'include', 'have', 'consist of' and the like mentioned in this specification are used, other parts may be added unless the expression '~ man' is used. If a component is expressed in singular, plural is included unless otherwise specified. In addition, in analyzing the components, it is interpreted as including an error range even if there is no explicit description.

In the case of the description of the positional relationship, for example, when the positional relationship of two parts is described as '~ top', '~ upper', '~ bottom', '~ side', etc., 'right' Alternatively, one or more other parts may be located between the two parts unless the expression 'direct' is used.

In the case of a description of a time relationship, for example, 'after', 'following', '~ after', '~ before', etc., when the temporal sequential relationship is described, 'right' or 'direct' It may also include cases that are not continuous unless the expression is used.

It should be understood that the term “at least one” includes all possible combinations from one or more related items.

Each of the features of the various embodiments of the present invention may be partially or wholly combined with or combined with each other, technically various interlocking and driving may be possible, and each of the embodiments may be independently implemented with respect to each other or may be implemented together in an associative relationship. It might be.

One embodiment of the present invention provides a tire 101 comprising rubber reinforcements 201, 301, 401, 501 (see FIGS. 1 and 2, 4, 5, 6).

1 is a partial cutaway view of a tire 101 according to an embodiment of the present invention.

Referring to FIG. 1, the tire 101 includes a tread 10, a shoulder 20, a side wall 30, a bead 40, and a belt. 50, inner liner 60, cacass 70 and capply 90.

The tread 10 is a portion that directly contacts the road surface. The tread 10 is a strong rubber layer attached to the outside of the cap ply 90, and is made of rubber having excellent abrasion resistance. The tread 10 plays a direct role of transmitting the driving and braking power of the vehicle to the ground. A groove 80 is formed in the region of the tread 10.

The shoulder 20 is a portion connected to the side wall 30 as an edge portion of the tread 10. The shoulder 20 is one of the weakest parts of the tire along with the side wall 30.

The side wall 30 is a side portion of the tire 101 connecting the tread 10 and the bead 40, protecting the carcass 70 and providing lateral stability to the tire.

The bead 40 is an area containing an iron wire that winds the end of the carcass 70, and has a structure in which a rubber film is coated on the iron wire and the cord paper is wrapped. Bead 40 serves to mount and secure the tire 101 on a wheel rim.

The belt 50 is a coat layer located in the middle of the tread 10 and the carcass 70. The belt 50 serves to prevent damage to internal components such as carcass 70 due to external shocks or external conditions, and maintains the shape of the tread 10 flat so that the tire 101 and the road surface Make sure the contact is kept in top condition. Belt 50 may include a rubber reinforcement (201, 301, 401, 501) according to another embodiment of the present invention (see Figures 2, 4, 5, 6).

The inner liner 60 is used instead of a tube in a tubeless tire, and is made of special rubber having little or no air permeability. The inner liner 60 prevents air filling the tire 101 from leaking.

The carcass (70) is made of several sheets of cord paper made of synthetic fibers with strong strength, and is an important part of forming the skeleton of the tire (101). The carcass 70 serves to withstand the load and impact received by the tire 101 and maintain air pressure. The carcass 70 may include rubber reinforcing materials 201, 301, 401, and 501 according to another embodiment of the present invention.

Groove 80 refers to the thick groove in the tread region. The groove 80 functions to increase the drainage of the tire when driving on a wet road surface.

The cap ply 90 is a protective layer under the tread 10 and protects other components inside. The cap fly 90 is essentially applied to a high-speed driving vehicle. Particularly, as the driving speed of the vehicle increases, a problem such as a deterioration of the ride due to deformation of the belt portion of the tire occurs, and the importance of the cap ply 90 preventing deformation of the belt portion is increasing. The cap ply 90 may be made of rubber reinforcing materials 201, 301, 401, and 501 according to another embodiment of the present invention.

Tire 101 according to an embodiment of the present invention includes a rubber reinforcement (201, 301, 401, 501). The rubber reinforcing materials 201 and 301 may be applied to the carcass 70 and may be applied to at least one of the belt 50 and the cap ply 90.

Other embodiments of the present invention provide rubber reinforcement (201, 301, 401, 501).

2 is a schematic cross-sectional view of a rubber reinforcement 201 according to another embodiment of the present invention.

The rubber reinforcement 201 according to another embodiment of the present invention includes a fiber base 210 and a rubber coating layer 220 on the fiber base 210.

The fiber substrate may be any one of a textile substrate 210 and a fiber yarn. The fiber yarn includes plied yarn 110. The rubber reinforcement 201 of FIG. 2 illustrates that a textile substrate 210 is used as the fiber substrate. However, one embodiment of the present invention is not limited to this, and a fiber yarn may be used as the fiber substrate.

As the textile substrate 210, a fabric woven using a fiber yarn may be used. The fiber yarn may include at least one of nylon, rayon, aramid and polyester including PET. In addition, the textile substrate 210 may be formed by weaving the filaments, or may be formed by weaving using a lower twisted yarn formed by the lower edge of the filaments. However, another embodiment of the present invention is not limited thereto, and textile substrates 210 woven by various fibers known in the art may be used as the fiber substrate according to another embodiment of the present invention.

For example, according to another embodiment of the present invention, fabrics made using polyester including nylon, rayon, aramid, and PET may be used as the textile substrate 210. The textile substrate 210 may also be made by weaving of the plied yarn 110 made of nylon, rayon, aramid, and polyester, which is selected from polyesters, which are selected from the lower twisted yarns 111 and 112 (see FIG. 3).

According to another embodiment of the present invention, the plied yarn 110 includes a hybrid plied yarn formed by two or more lower twisted yarns that are not identical to each other. Such a hybrid plied yarn may include, for example, a nylon lower yarn, an aramid lower yarn, or a PET lower yarn.

The rubber coating layer 220 is disposed on the fiber substrate. Referring to FIG. 2, the rubber coating layer 220 is disposed on a textile substrate 210 that is a fiber substrate.

According to another embodiment of the present invention, the rubber coating layer 220 is formed by a rubber coating solution. The rubber coating liquid may include a rubber compound solid content and a solvent.

For example, the rubber coating solution may contain 5 to 30% by weight of the rubber compound solids and 70 to 95% by weight of the solvent relative to the total weight of the rubber coating solution. The rubber compound solids contained in the rubber coating liquid constitute the rubber coating layer 220.

If the concentration of the rubber compound solid content in the rubber coating liquid is less than 5% by weight, the viscosity of the rubber coating liquid is excessively lowered, and the thickness of the rubber coating layer 220 becomes thin, so that adhesiveness and adhesion are not properly expressed. Accordingly, the manufacturing characteristics of the tire may be deteriorated and a tire defect problem may occur during driving.

On the other hand, when the concentration of the rubber compound solids content in the rubber coating solution exceeds 30% by weight, the agitation property decreases due to the increase in viscosity, and the dispersibility of the rubber compound solids decreases, resulting in problems such as poor coating properties and uneven coating thickness. Is effected.

More specifically, when considering the volatilization of the solvent contained in the rubber coating solution, the rubber coating solution may include 3 to 25% by weight of the rubber compound solid content and 75 to 97% by weight of the solvent as a basis for manufacturing. In this case, when the solvent is volatilized after preparing the rubber coating liquid, the content of the rubber compound solids contained in the rubber coating liquid may be 5 to 30% by weight.

In addition, the rubber coating solution has a viscosity of 200 to 90,000 cP.

When the viscosity of the rubber coating liquid is less than 200 cP, due to the high flowability due to the low viscosity of the rubber coating liquid, it may be difficult to perform a coating operation of coating the rubber coating liquid on the fiber substrate, and the thickness of the rubber coating layer 220 It becomes thinner and it is difficult to express performance with the tire reinforcement material.

On the other hand, when the viscosity of the rubber coating solution exceeds 90,000 cP, it is difficult to stir the rubber coating solution, it is difficult to prepare a uniform rubber coating solution, and also, due to the high viscosity, uniform coating is difficult and deviations in coating thickness may occur. have. As a result, difficulties may arise in the production of the rubber reinforcement 201 and tire production, and the rubber reinforcement 201 may be difficult to express the tire reinforcement function.

The rubber compound solid content may include a rubber component and carbon black.

The rubber compound solids are, for example, natural rubber (NR), styrene butadiene rubber (SBR), butadiene rubber (BR), chloroprene rubber (CR) and isobutylene rubber (IBR), isoprene rubber (IR), nitrile rubber. (NBR), butyl rubber and at least one rubber component selected from neoprene rubber and carbon black.

Further, the rubber compound solid content may further include an additive. Participants include, for example, para oil, zinc oxide, stearic acid, anti-aging agents, sulfur, vulcanization accelerators, activators, adhesives, adhesives, and the like.

For example, the rubber compound solids may include 50 to 70% by weight of the rubber component, 15 to 40% by weight of carbon black, and 5 to 15% by weight of additives relative to the total weight of the rubber compound solids.

When the content of the rubber component in the rubber compound solid content is less than 50% by weight, the viscosity of the rubber coating solution becomes less than 200 cP, and thus there is a fear that the coating property is deteriorated. On the other hand, if the content of the rubber component in the rubber compound solid content exceeds 70% by weight, the viscosity of the rubber coating solution may exceed 90,000 cP.

The rubber component and carbon black are the main components of the rubber compound solids. Therefore, the mixture of the rubber component and the carbon black may be simply referred to as the "main component".

According to another embodiment of the present invention, the mixture of rubber component and carbon black (main component) may include 50 to 78 parts by weight of the rubber component and 22 to 50 parts by weight of carbon black based on 100 parts by weight.

When the content of the rubber component is less than 50 parts by weight and the content of carbon black exceeds 50 parts by weight based on 100 parts by weight of the total weight of the mixture of rubber components and carbon black (main component), the viscosity of the rubber coating solution is less than 200 cP. Since it is deteriorated, the rubber coating liquid may flow off without being coated on the fiber substrate.

On the other hand, when the content of the rubber component exceeds 78 parts by weight and the content of carbon black is less than 22 parts by weight based on the total weight of 100 parts by weight of the mixture of rubber component and carbon black (main component), the solid content of the rubber compound is smooth in the solvent. It does not dissolve too much and can cause lumps. This is due to excessive crosslinking of rubber, and even if the content (concentration) of the rubber compound solid content in the rubber coating solution is lowered, a lump that does not dissolve in the solvent is generated. As a result, the viscosity of the rubber coating liquid may be excessively increased in excess of 90,000 cP, and the rubber coating liquid may not be smoothly coated on the fiber substrate, and the thickness of the rubber coating layer 220 may be uneven.

More specifically, the mixture (main component) of the rubber component and the carbon black may include 60 to 78 parts by weight of the rubber component and 22 to 40 parts by weight of the carbon black based on 100 parts by weight. In order to form a more uniform ball coating layer 220, the mixture of the rubber component and the carbon black (main component) may include 70 to 75 parts by weight of the rubber component and 25 to 30 parts by weight of the carbon black based on 100 parts by weight of the total weight. You can.

The solvent contains a substance capable of dissolving the rubber component. According to another embodiment of the present invention, there is no particular limitation on the type of solvent. For example, the solvent may include at least one selected from toluene, naphtha, methanol, xylene, and tetrahydrofuran. Toluene, naphtha, methanol, xylene and tetrahydrofuran can be used alone or in combination.

The rubber coating layer 220 formed by the rubber coating solution includes natural rubber (NR), styrene butadiene rubber (SBR), butadiene rubber (BR), chloroprene rubber (CR) and isobutylene rubber (IBR), isoprene rubber (IR), Nitrile rubber (NBR), butyl rubber, and at least one selected from neoprene rubber. In addition, the rubber coating layer 220 includes carbon black.

The rubber coating layer 220 has a thickness t1 of 10 to 100 μm.

As shown in FIG. 2, the thickness t1 of the rubber coating layer 220 is measured as a distance from one surface of the rubber coating layer 220 in contact with the textile substrate 210 which is a fiber substrate to the other surface of the rubber coating layer 220. .

If the thickness (t1) of the rubber coating layer 220 is less than 10 μm, the rubber coating layer 220 may not have sufficient adhesiveness and adhesive strength, resulting in deterioration of tire manufacturing characteristics, difficulty in tire durability development, and defects in the tire. have.

When the thickness t1 of the rubber coating layer 220 exceeds 100 μm, the thickness of the rubber reinforcement 201 may be increased to increase the thickness of the tire. In addition, when the thickness t1 of the rubber coating layer 220 exceeds 100 μm, bubbles may be generated in the rubber coating layer 220 in the process of volatilization of the solvent, so that the rubber reinforcement 201 may not have a uniform thickness, When the rubber reinforcement 201 is applied to the tire, an air pocket may be generated in the tire. When a pocket (air pocket) occurs, the tire quality deteriorates and the defect rate increases. In addition, it is inefficient in the process because the coating operation must be performed several times to form the thick rubber coating layer 220, and the quality of the tire and the defective rate may be caused.

In the rubber reinforcement according to the related art, a rubber substrate is rolled on a fiber substrate, for example, a textile substrate 210 to form a rubber layer. Since the rubber substrate has a predetermined thickness, the rubber layer of the rubber reinforcement formed according to the method of the related art generally has a thickness of 1000 µm or more, and a thickness of at least 800 µm or more.

On the other hand, the rubber coating layer 220 according to another embodiment of the present invention may be formed by dipping or coating of a rubber coating liquid, and thus may have a thin thickness t1 of 10 μm to 100 μm. According to another embodiment of the present invention, since the rubber coating layer 220 has a thin thickness t1 of 100 μm or less, the overall thickness of the rubber reinforcement 201 is thinned. Accordingly, the thickness of the tire using the rubber reinforcing material 201 may be thinned.

The rubber reinforcement 201 according to another embodiment of the present invention may be applied to the carcass 70, the cap ply 90, or the belt 50 of the tire 101.

3 is a schematic view of a plied yarn, and FIG. 4 is a schematic cross-sectional view of a rubber reinforcement 301 according to another embodiment of the present invention.

According to another embodiment of the present invention, the fiber yarn may be used as a fiber substrate of the rubber reinforcement 301. As the fiber yarn, for example, untwisted yarn or one lower twisted yarn 111 may be used. Alternatively, the two or more lower twisted yarns 111 and 112 may be used as a twisted yarn 110 made of phased yarn (see FIG. 3).

4 illustrates that the plied yarn 110 is used as the fiber base material of the rubber reinforcement 301. The plied yarn 110 may be formed by performing two or more lower twisted yarns 111 and 112 as described above. However, one embodiment of the present invention is not limited thereto, and other plywood yarns known in the art may be used in the production of the rubber reinforcement 301. The first lower twisted yarn 111 and the second lower twisted yarn 112 may be the same or different from each other. For example, the first lower twisted yarn 111 and the second lower twisted yarn 112 may be selected from polyesters including nylon, rayon, aramid, and PET, respectively. According to another embodiment of the present invention, the plywood yarn 110 may be referred to as a cord.

The rubber reinforcing material 301 according to another embodiment of the present invention includes a fiber-based plied yarn 110 and a rubber coating layer 220 on the plied yarn 110.

Since the rubber coating layer 220 has already been described, detailed descriptions thereof are omitted to avoid duplication.

5 is a schematic cross-sectional view of a rubber reinforcement 401 according to another embodiment of the present invention.

The rubber reinforcing material 401 shown in FIG. 5 further includes an adhesive layer 230 on the fiber substrate, as compared with the rubber reinforcing material 201 shown in FIG. 2, and the rubber coating layer 220 is disposed on the adhesive layer 230 do.

Specifically, the rubber reinforcing material 401 illustrated in FIG. 5 includes a textile substrate 210, an adhesive layer 230 disposed on the textile substrate 210, and a rubber coating layer 220 disposed on the adhesive layer 230. It includes.

The adhesive layer 230 includes resorcinol-formaldehyde-latex. For example, the adhesive layer 230 may be formed by an adhesive coating solution containing resorcinol-formaldehyde-latex (RFL) and a solvent. According to another embodiment of the present invention, the adhesive layer 230 may include an epoxy compound layer and a resorcinol-formaldehyde-latex (RFL) layer disposed on the epoxy compound layer.

Resorcinol-formaldehyde-latex is also called "RFL" and acts as an adhesive component. Resorcinol-formaldehyde-latex, in particular, improves the affinity and adhesion between the textile substrate, the textile substrate 210 and the rubber component to improve the adhesion between the textile substrate 210 and the rubber coating layer 220, rubber The adhesion between the reinforcing material 201 and rubber is improved. Accordingly, the textile substrate 210 and the rubber coating layer 220 are stably attached without being separated from each other, and occurrence of defects in the manufacturing process of the tire 101 is prevented.

The adhesive layer 230 may include an epoxy compound. The adhesive layer 230 may include, for example, an epoxy compound layer and a resorcinol-formaldehyde-latex (RFL) layer disposed on the epoxy compound layer.

6 is a schematic cross-sectional view of a rubber reinforcement according to another embodiment of the present invention.

The rubber reinforcing material 501 shown in FIG. 6 further includes an adhesive layer 230 on the fiber substrate, compared to the rubber reinforcing material 301 shown in FIG. 4, and the rubber coating layer 220 is disposed on the adhesive layer 230 do.

Specifically, the rubber reinforcing material 501 shown in FIG. 6 is a fiber-based plied yarn 110, an adhesive layer 230 disposed on the plied yarn 110, and a rubber coating layer 220 disposed on the adhesive layer 230. It includes.

Hereinafter, a method of manufacturing the rubber reinforcing materials 201 and 301 described above will be described.

Method of manufacturing a rubber reinforcing material (201, 301) according to another embodiment of the present invention, preparing a fiber substrate (210, 110), forming an adhesive layer 230 on the fiber substrate (210, 110) Step and forming a rubber coating layer 220 on the adhesive layer 230 by applying a rubber coating solution on the adhesive layer 220 and heat treatment.

The fiber substrates 210 and 110 may be any one of a fiber yarn and a textile substrate 210. The textile substrate 210 is formed by weaving fiber yarns. As a fiber yarn, a yarn, a lower twisted yarn or a plied yarn 110 may be used. A hybrid pneumatic yarn composed of two or more lower yarns that are not identical to each other may be used as the pneumatic yarn 110. The plywood yarn 110 may be used as a cord.

For example, the hybrid plied yarn may include nylon twisted yarn and aramid twisted yarn. The nylon lower twisted yarn may have a fineness of 300 to 2000 de, and the aramid lower twisted yarn may have a fineness of 500 to 3000 de.

Specifically, the nylon filament of 300 to 2000 de as the first lower twisted yarn 111, and the aramid filament of 500 to 3000 de as the second lower twisted yarn 112, the lower edge using a cable corder twister It is possible to manufacture the plywood yarn 110 by performing counterclockwise and upper stage clockwise simultaneously with the lower edge and the upper stage respectively. The twisted yarn 110 may have a twist number of 150 to 500 TPM.

Thus formed, the rubber coating liquid is applied to the fiber substrates 210 and 110 and dried to form the rubber coating layer 220.

The rubber coating solution contains a rubber compound solid content and a solvent. Specifically, the rubber coating solution contains 5 to 30% by weight of the rubber compound solids and 70 to 95% by weight of the solvent.

If the concentration of the rubber compound solid content in the rubber coating solution is less than 5% by weight, the thickness (t1) of the rubber coating layer 220 is thinned, and adhesion and adhesion are not properly exhibited. Accordingly, the manufacturing characteristics of the tire may be deteriorated and a tire defect problem may occur during driving. On the other hand, when the concentration of the rubber compound solid content in the rubber coating liquid exceeds 30% by weight, the agitation property of the adhesive liquid decreases due to an increase in viscosity, thereby lowering the dispersibility of the rubber coating liquid. The problem is brought about.

Therefore, in the rubber coating liquid, the concentration of the rubber compound solid content is adjusted in the range of 5 to 30% by weight.

When considering the volatilization of the solvent contained in the rubber coating solution, the rubber coating solution may include 3 to 25% by weight of the rubber compound solid content and 75 to 97% by weight of the solvent, based on manufacturing. In this case, when the solvent is volatilized after preparing the rubber coating liquid, the content of the rubber compound solids contained in the rubber coating liquid may be 5 to 30% by weight.

In addition, the rubber coating solution has a viscosity of 200 to 90,000 cP.

When the viscosity of the rubber coating liquid is less than 200 cP, due to the high flowability due to the low viscosity of the rubber coating liquid, it may be difficult to perform a coating operation of coating the rubber coating liquid on the fiber substrate, and the thickness of the rubber coating layer 220 It becomes thinner and it is difficult to express performance with the tire reinforcement material.

On the other hand, when the viscosity of the rubber coating solution exceeds 90,000 cP, it is difficult to stir the rubber coating solution, it is difficult to prepare a uniform rubber coating solution, and also, due to the high viscosity, uniform coating is difficult and deviations in coating thickness may occur. have. As a result, difficulties may arise in the production of the rubber reinforcement 201 and tire production, and the rubber reinforcement 201 may be difficult to express the tire reinforcement function.

The rubber compound solid content includes a rubber component and carbon black.

The rubber compound solids are, for example, natural rubber (NR), styrene butadiene rubber (SBR), butadiene rubber (BR), chloroprene rubber (CR) and isobutylene rubber (IBR), isoprene rubber (IR), nitrile rubber. (NBR), butyl rubber and at least one rubber component selected from neoprene rubber and carbon black.

Further, the rubber compound solid content may further include an additive. Participants include, for example, para oil, zinc oxide, stearic acid, anti-aging agents, sulfur, vulcanization accelerators, activators, adhesives, adhesives, and the like.

For example, the rubber compound solids may include 50 to 70% by weight of the rubber component, 15 to 40% by weight of carbon black, and 5 to 15% by weight of additives relative to the total weight of the rubber compound solids.

If the content of the rubber component in the rubber compound solid content is less than 50% by weight, the viscosity of the rubber coating solution may be less than 200 cP, and coating properties may be deteriorated. When the content of the rubber component exceeds 70% by weight, the viscosity of the rubber coating solution May exceed 90,000 cP.

The rubber component and carbon black are the main components of the rubber compound solids. Therefore, the mixture of the rubber component and the carbon black may be simply referred to as a "main component." The mixture of the rubber component and the carbon black (main component) is 50 to 78 parts by weight of the rubber component and 22 to 50 parts by weight based on 100 parts by weight of the total weight. And negative carbon black.

When the content of the weight of the rubber component is less than 50 parts by weight and the content of carbon black exceeds 50 parts by weight based on 100 parts by weight of the total weight of the mixture of rubber components and carbon black (main component), the viscosity of the rubber coating solution is 200 cP. It is lowered to less than, and the rubber coating liquid may flow down without being coated on the fiber base.

On the other hand, when the content of the rubber component exceeds 78 parts by weight and the content of carbon black is less than 22 parts by weight based on the total weight of 100 parts by weight of the mixture of rubber component and carbon black (main component), the solid content of the rubber compound is smooth in the solvent. It does not dissolve, and a lump occurs, and since the viscosity of the rubber coating solution is excessively increased to exceed 90,000 cP, the rubber coating solution is not smoothly coated on the fiber substrate, and the thickness of the rubber coating layer 220 may be uneven. have.

More specifically, the mixture (main component) of the rubber component and the carbon black may include 60 to 78 parts by weight of the rubber component and 22 to 40 parts by weight of the carbon black based on 100 parts by weight. In order to form a more uniform ball coating layer 220, the mixture of the rubber component and the carbon black (main component) may include 70 to 75 parts by weight of the rubber component and 25 to 30 parts by weight of the carbon black based on 100 parts by weight of the total weight. You can.

The solvent contains a substance capable of dissolving the rubber component. For example, the solvent may include at least one selected from toluene, naphtha, methanol, xylene, and tetrahydrofuran. Toluene, naphtha, methanol, xylene and tetrahydrofuran may be used alone or in combination with each other.

There is no particular limitation on the method of applying the rubber coating solution on the adhesive layer 230, and a known coating method can be applied.

For example, to form the rubber coating layer 220, the fiber substrates 210 and 110 may be immersed in a rubber coating solution. By such immersion, a rubber coating solution is applied on the fiber substrates 210 and 110.

In addition, the rubber coating liquid may be applied on the fiber substrates 210 and 110 by comma coating using a comma coater. At this time, the coating may be made at a temperature condition of 15 to 50 ℃. This temperature corresponds to the lowest temperature at which the solvent can volatilize.

However, another embodiment of the present invention is not limited thereto, and a coating of the rubber coating solution may be performed by a gravure coating method, a micro gravure coating method, or the like.

After coating of the rubber coating liquid, the coated rubber coating liquid is dried. Heat treatment may be performed for drying. For example, the step of forming the rubber coating layer 220 may include applying a rubber coating solution on the fiber substrates 210 and 110, followed by heat treatment.

Heat treatment may be performed in a heat treatment apparatus. For heat treatment, heat may be applied at a temperature of 70 to 150 ° C. for 30 to 150 seconds. Accordingly, a rubber coating layer 220 is formed on the fiber substrates 210 and 110.

Through these processes, rubber reinforcing materials 201 and 301 are manufactured, and the manufactured rubber reinforcing materials 201 and 301 are wound on a winder.

The rubber coating layer 220 manufactured as described above may have a thickness t1 of 10 μm to 100 μm. The thickness t1 of the rubber coating layer 220 is less than 10 µm, and the rubber coating layer 220 does not have sufficient adhesiveness and adhesive strength, thereby deteriorating tire manufacturing characteristics and causing defects in the tire. When the thickness t1 of the rubber coating layer 220 exceeds 100 μm, the thickness of the rubber reinforcement 201 may be increased to increase the thickness of the tire.

Next, an optional slitting step may be performed.

The rubber reinforcing material 201 made in a plate shape may be cut as necessary or according to the purpose of use, and such cutting is referred to as slitting. The slitting step may be omitted. There is no particular limitation on the cutting or slitting method.

Through these processes, rubber reinforcement materials 201 and 301 according to embodiments of the present invention are completed.

The rubber reinforcing materials 201 and 301 manufactured as described above may be applied to, for example, the cap ply 90 of the tire 101, the belt 50, or the carcass 70.

The rubber reinforcing material 201 according to an embodiment of the present invention has excellent adhesion to rubber, and can be easily attached to the rubber without an existing rolling process. When the rubber reinforcing material 201 is used as, for example, the carcass 70, the rolling process may be omitted, so the manufacturing process of the tire may be simplified. In addition, the adhesion of the carcass 70 is greatly increased, and the air pocket is reduced when manufacturing the green tire, thereby reducing the tire defect rate. In addition, since the rolling process is not performed, the thin and light tire 101 may be made. The rubber reinforcement 201 and 301 may also be applied to the belt 50 or the cap ply 90.

The manufacturing method of the rubber reinforcing materials (401, 501) according to another embodiment of the present invention, prior to the step of forming the rubber coating layer 220, forming the adhesive layer 230 on the fiber substrate (210, 110) It may further include.

Specifically, the manufacturing method of the rubber reinforcing material (401, 501) according to another embodiment of the present invention, preparing a fiber substrate (210, 110), the adhesive layer (230) on the fiber substrate (210, 110) And forming a rubber coating layer 220 on the adhesive layer 230 by applying and drying the rubber coating solution on the adhesive layer 220.

The adhesive layer 230 is formed on the fiber substrates 210 and 110.

The adhesive layer 230 may be formed by an adhesive coating solution containing resorcinol-formaldehyde-latex (RFL) and a solvent. The step of forming the adhesive layer 230 may include applying an adhesive coating solution on the fiber substrates 210 and 110 and heat-treating it.

There is no particular limitation on the method of applying the adhesive coating solution on the fiber substrates 210 and 110. For example, by dipping the fiber substrates 210 and 110 in the adhesive coating solution, the adhesive coating solution may be applied on the fiber substrates 210 and 110. For example, the immersion process may be performed by passing the fiber substrates 210 and 110 through the adhesive coating solution. The immersion process may be performed in a dipping machine in which tension, immersion time and temperature can be controlled.

In addition to the immersion process, the adhesive coating liquid may be applied to the fiber substrates 210 and 110 by coating using a blade or coater or spraying using a sprayer.

The step of forming the adhesive layer 230 may further include a process of applying an adhesive coating solution on the fiber substrates 210 and 110, drying at 100 to 170 ° C for 80 to 120 seconds, and heat treatment at 200 to 250 ° C. have. Heat treatment may be performed in a heat treatment apparatus. By heat treatment, the resorcinol-formaldehyde-latex (RFL) layer 222 is cured and fixed to complete the adhesive layer 230. The adhesive layer 230 may be more stably formed by the heat treatment.

The adhesive layer 230 may include an epoxy compound. The adhesive layer 230 may have, for example, a structure in which a resorcinol-formaldehyde-latex (RFL) layer is disposed on an epoxy compound layer.

After forming the adhesive layer 220, a rubber coating solution is applied on the adhesive layer 230 and dried to form the rubber coating layer 220 on the adhesive layer 230.

Hereinafter, the operation and effects of the invention will be described in more detail through specific production examples and comparative examples of the invention. However, these manufacturing examples and comparative examples are merely presented by way of example, and the scope of the invention is not limited thereby.

<Example 1-5 and Comparative Example 1-4> Preparation of rubber reinforcement

(1) Manufacture of textile substrate: PET tire cord woven fabric production

PET filaments having a total fineness of 1000de were woven into a top and bottom edge of 470TPM using a cable coder, and then woven at a density of 32 EPI to prepare a textile substrate 210. The textile substrate 210 thus manufactured was used as a fiber substrate.

The textile substrate 210 thus prepared was immersed in a conventional epoxy compound and a lesocinol-formaldehyde-latex compound, dried and heat-treated to form an adhesive layer on the textile substrate 210.

(2) Formation of rubber coating layer

According to the composition of Table 1, a rubber coating solution for forming the rubber coating layer 220 was prepared.

The rubber compound solids include the rubber component, carbon black and additives.

As the rubber component, natural rubber (NR) and styrene butadiene rubber (SBR) were used.

Table 1 shows the weight ratios of natural rubber (NR), styrene butadiene rubber (SBR) and carbon black. The weight ratio of the components in Table 1 represents the relative weight with respect to 100 parts by weight of the mixture of rubber components and carbon black (main component).

Specifically, the rubber compound solid content contains 94% by weight of the main component (a mixture of rubber component and carbon black) and 6% by weight of additives. Since the content of the additive is the same in both Example 1-5 and Comparative Example 1-4, the content of the additive is not disclosed in Table 1.

As additives, para-oil, zinc oxide, stearic acid, antioxidants, sulfur and vulcanization accelerators were used. Based on the total weight of rubber compound solids, 5% by weight of para oil, 0.3% by weight of zinc oxide, 0.2% by weight of stearic acid, 0.2% by weight of anti-aging agents (RUBBER ANTIOXIDANTS, BHT), 0.2% by weight of sulfur and vulcanization accelerators (ZnBX) 0.1% by weight was used.

A rubber compound composition of 15% by weight based on the total weight of the rubber coating solution was used.

Solvents include toluene and tetrahydrofuran. Toluene and tetrahydrofuran were used in a weight ratio of 20:80. An 85% by weight solvent was used based on the total weight of the rubber coating solution.

A rubber coating liquid was prepared by dispersing and dissolving the rubber compound solid content in the weight ratio of Table 1 in the solvent prepared as described above. In Table 1, the content of the rubber compound solid content and the solvent was expressed as weight% (wt%).

Using a comma coater, a rubber coating solution was applied to the textile substrate 210 and dried at a temperature of 80 ° C. to volatilize the solvent to form a rubber coating layer 220. As a result, rubber reinforcements according to Examples 1-5 and Comparative Examples 1-4 were prepared.

division Rubber compound solids menstruum
(wt%) Weight ratio (NR: SBR: Carbon black) Content (wt%) Example 1 35: 35: 30 15 85 Example 2 62:10:10 15 85 Example 3 73: 0: 27 15 85 Example 4 60:15:25 15 85 Example 5 70: 5: 25 15 85 Comparative Example 1 20: 20: 60 15 85 Comparative Example 2 30: 0: 70 15 85 Comparative Example 3 65: 20: 15 15 85

<Evaluation 1> Solubility evaluation

Whether the rubber compound solids were smoothly dispersed in the mixed solvent and whether undispersed lumps were present were visually evaluated and determined as follows.

○: Smooth dispersion

X: Dispersion is not smooth, and undispersed lumps are present.

<Evaluation 2> Viscosity Measurement

The viscosity of the rubber coating solution was measured using a Brookfield DV2TLV viscometer (Tk: 0.09373) at a standard state (temperature 20 ° C., relative humidity 65%). Under STP, the viscosity was measured 6 times in total for 30 minutes in 3 minutes. The viscosity range (cP) that can be measured with the instrument is 15 to 6000000, and the spindles used for evaluation are VL-01, VL-02, VL-03, and VL-04.

<Evaluation 3> Coating property evaluation

The coating property when the rubber coating liquid was coated on a textile substrate (nylon plain woven fabric) was evaluated. For coating properties evaluation, Hot Melt Coater HLC-101 from ChemInstruments was used. After applying a temperature of 80 ° C to the roll of the device, the coating property was evaluated while coating the rubber coating liquid on the textile substrate.

<Evaluation 4> Thickness Measurement

The thickness of the rubber coating layer 220 formed on the rubber reinforcement prepared in Example 1-5 and Comparative Example 1-4 was measured using Vernier Calipers of Mitutoyo.

The measurement results are shown in Table 2.

division Solubility Viscosity (cP) Coating properties Thickness (㎛) Example 1 ○ 463 ○ 15 Example 2 ○ 2616 ○ 35 Example 3 ○ 18038 ○ 42 Example 4 ○ 53400 ○ 100 Example 5 ○ 828750 ○ 180 Comparative Example 1 ○ 102 Poor processability due to flow of rubber coating liquid Less than 5 Comparative Example 2 ○ 39 Poor processability due to flow of rubber coating liquid Less than 5 Comparative Example 3 x Over 100,000
(Not measurable) Uneven coating thickness 150 ~ 350 Comparative Example 4 x 100,000 or more
(Not measurable) Uneven coating thickness 230 ~ 500

<Example 6-8 and Comparative Example 5-7> Tire production

Tires of the 205 / 55R16 standard were manufactured using the rubber reinforcing materials of Examples 2, 3, 5 and Comparative Examples 1 and 3, and these were referred to as Examples 6, 7, 8 and Comparative Examples 5 and 6, respectively.

In addition, a tire was manufactured through a rubber rolling process, and this was referred to as Comparative Example 7.

Specifically, for tire manufacturing, bodyplies and steel cord belts including 1300De / 2ply HMLS tire cords were used. After layering the rubber reinforcement for body ply on the inner liner rubber, and laminating the bead wire and the belt portion, the rubber reinforcement prepared in the above Examples and Comparative Examples was added (carcass), tread portion, shoulder portion and side wall portion. Green tires were manufactured by sequentially forming rubber layers for formation. The green tire thus prepared was placed in a vulcanizing mold and vulcanized at 170 ° C for 15 minutes to prepare a tire. The standard of the manufactured tire is 205 / 55R16.

<Evaluation 5> Durability evaluation

The durability of the tires prepared in Example 6-8 and Comparative Example 5-7 was evaluated using a drum type driving durability tester.

Specifically, after the tires prepared in Examples 6-8 and Comparative Examples 5-7 were applied in a drum type driving endurance tester, high speed driving durability was increased while increasing the speed to 20 to 30 km / h in 10 minute increments after the start of driving. Was evaluated. Durability was expressed as the time until the tire bursts (explosion or puncture) after the tire starts to run in the driving durability tester.

Results are shown in Table 3.

division standard Application site Tire weight (Kg) Durability (hours: minutes) Example 6 205 / 55R16 Carcass 10.2 1:50 Example 7 205 / 55R16 Carcass 10.2 1:52 Example 8 205 / 55R16 Carcass 10.3 1:49 Comparative Example 5 205 / 55R16 Carcass 10.2 0:48 Comparative Example 6 205 / 55R16 Carcass 10.3 1:28 Comparative Example 7 205 / 55R16 Carcass 10.6 1:48

Referring to Table 3, the tires of Examples 6-8, which are tires prepared by omitting the rolling process, have the same level of durability as the tires of Comparative Example 7 manufactured through a rolling process using common tire cords in related fields. You can confirm that you have On the other hand, it can be seen that the tires of Examples 6-8 are 0.3 to 0.4 kg lighter than the tires of Comparative Example 7.

As described above, it can be confirmed that the tires of Examples 6-8 manufactured according to the present invention are light in weight and have the same durability as the conventional tires in related fields.

10: tread 20: shoulder
30: Sidewall 40: Bead
50: belt 60: inner liner
70: carcass 80: groove
90: cap fly 101: tire
110: speaker 111: first speaker
112: second lower yarn 201: rubber reinforcement
210: textile base material 220: rubber coating layer
230: adhesive layer

Claims (17)

Fiber substrates; And
Including; a rubber coating layer on the fiber substrate,
The rubber coating layer is formed by a rubber coating solution,
The rubber coating solution, based on the total weight of the rubber coating solution, comprises 5 to 30% by weight of rubber compound solids and 70 to 95% by weight of solvent,
Rubber reinforcement. According to claim 1,
The rubber coating layer has a thickness of 10 to 100 ㎛, rubber reinforcement. According to claim 1,
The rubber compound solids,
At least one rubber component selected from natural rubber, styrene butadiene rubber, butadiene rubber, chloroprene rubber, isobutylene rubber, isoprene rubber, nitrile rubber, butyl rubber and neoprene rubber; And
Carbon black; containing,
Rubber reinforcement. According to claim 3,
The rubber compound solid content is based on 100 parts by weight of the mixture of the rubber component and the carbon black,
50 to 78 parts by weight of a rubber component; And
22 to 50 parts by weight of carbon black;
Rubber reinforcement comprising a. According to claim 1,
The solvent comprises at least one selected from toluene, naphtha, methanol, xylene and tetrahydrofuran, rubber reinforcement. According to claim 1,
The rubber coating solution has a viscosity of 200 to 90,000 cP, rubber reinforcement. According to claim 1,
The fiber substrate is any one of a fiber yarn, a textile substrate and a cord, a rubber reinforcement. According to claim 1,
Further comprising an adhesive layer on the fiber substrate,
The rubber coating layer is disposed on the adhesive layer, a rubber reinforcement. The method of claim 8,
The adhesive layer comprises a resorcinol-formaldehyde-latex (RFL), rubber reinforcement. Preparing a fiber substrate; And
Including the step of applying a rubber coating liquid on the fiber substrate and drying to form a rubber coating layer;
The rubber coating solution, based on the total weight of the rubber coating solution, comprises 5 to 30% by weight of rubber compound solids and 70 to 95% by weight of solvent,
Method for manufacturing rubber reinforcement. The method of claim 10,
The rubber coating solution has a viscosity of 200 to 90,000 cP, a method of manufacturing a rubber reinforcement. The method of claim 10,
The rubber coating layer has a thickness of 10㎛ to 100㎛, the manufacturing method of the rubber reinforcement. The method of claim 10,
The rubber compound solids,
At least one rubber component selected from natural rubber, styrene butadiene rubber, butadiene rubber, chloroprene rubber, isobutylene rubber, isoprene rubber, nitrile rubber, butyl rubber and neoprene rubber; And
Carbon black; containing,
Method for manufacturing rubber reinforcement. The method of claim 13,
The rubber compound solid content is based on 100 parts by weight of the mixture of the rubber component and the carbon black,
50 to 78 parts by weight of a rubber component; And
22 to 50 parts by weight of carbon black;
Method of manufacturing a rubber reinforcement comprising a. The method of claim 10,
The solvent is at least one selected from toluene, naphtha, methanol, xylene, and tetrahydrofuran, a method of manufacturing a rubber reinforcement. The method of claim 10,
Before forming the rubber coating layer, further comprising the step of forming an adhesive layer on the fiber substrate, a method of manufacturing a rubber reinforcement. A tire comprising the rubber reinforcing material according to claim 1.

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