Tire cord, method for its preparation, sheet comprising it and tire comprising the sheet

Abstract

This invention relates to a tire cord fabric, its manufacturing method, a sheet comprising the same, and a tire comprising the sheet. The tire cord fabric includes: a plurality of tire cords arranged parallel to each other; a weft yarn woven from the tire cords; and conductive fibers in contact with the surface of the tire cords and extending along the length of the tire cords. When the tire cord fabric is woven by incorporating conductive fibers into the tire cords, static electricity accumulated on the tire can be effectively released. In particular, like the carcass cords, the conductive fibers extend radially from the bead portion to the tread portion, thereby ensuring an effective conductive path. Consequently, since the requirements for the conductivity of the rubber composition used for the sidewall and the bonding rubber composition are reduced, rubber compositions with a low loss modulus for improving rolling resistance can be used. As a result, static electricity problems can be solved and fuel consumption can be improved through low rolling resistance.

Description

[0001] This application is a divisional application of Chinese patent application No. 201910966953.6 entitled "Tire Cord Fabric, Method of Preparation Thereof, Sheet Thereof and Tire Including the Sheet Thereof", which was filed on October 11, 2019, and has a priority date of October 26, 2018. Technical Field

[0002] This invention relates to a tire cord fabric, a method for preparing the same, a sheet comprising the same, and a tire comprising the sheet. More specifically, it relates to a tire cord fabric, a method for preparing the same, a sheet comprising the same, and a tire comprising the sheet, which can effectively release static electricity accumulated on the tire and improve fuel consumption through low rolling resistance. Background Technology

[0003] In the past, carbon-based rubber compositions did not present significant static electricity issues. However, with increasing demands for vehicle traction and fuel efficiency, the application of high-loading silica rubber compositions has also increased. Rubber compositions with high silica content present problems in releasing static electricity to the road surface.

[0004] As a method for releasing static electricity from tires with low rolling resistance (LRR) to the road surface, a configuration including a sidewall rubber composition with predetermined or higher conductivity, an electrically conductive tread rubber composition, and a chimney is conceivable. However, increasing the carbon content used for electrical conduction in the sidewall increases heat generation in the sidewall, which is detrimental to LRR. Furthermore, developing conductive LRR sidewall rubber compositions or conductive LRR carcass rubber compositions could be considered, but there are practical limitations to the development of LRR rubber compositions with a tire resistance value of 100 MΩ or lower at 1000V, which is required by automakers.

[0005] Furthermore, rolling resistance (LRR) performance and electrical conductivity are a trade-off, and developing rubber compositions that simultaneously satisfy both LRR performance and electrical conductivity requires significant time and expense. In particular, due to the substantial impact of rolling resistance on existing sidewall rubber compositions, when using rubber compositions with low rolling resistance characteristics while sacrificing sidewall electrical conductivity, imparting electrical conductivity to the carcass rubber composition is the most common approach. However, imparting electrical conductivity to the carcass rubber composition requires the use of carbon black with a highly developed structure that increases both electrical conductivity and rubber strength or modulus. The problem with this method is that the rubber composition is not conducive to heat generation during calendering, making it difficult to process. Moreover, using more structurally developed carbon to achieve the desired electrical conductivity results in a gradual deterioration in processability. Therefore, achieving both electrical conductivity and low rolling resistance simultaneously in tires is technically challenging. Summary of the Invention

[0006] Technical issues

[0007] The purpose of this invention is to provide a tire cord that can effectively release static electricity accumulated on the tire and improve fuel consumption through low rolling resistance.

[0008] Another object of the present invention is to provide a method for preparing tire cord fabric that can be applied using existing bonding processes without the need for additional equipment.

[0009] Another object of the present invention is to provide a sheet comprising the above-described tire cord fabric.

[0010] Another object of the present invention is to provide a tire comprising the above-described sheet material.

[0011] Solution to the problem

[0012] An embodiment of the present invention provides a tire cord fabric, the tire cord fabric comprising: a plurality of tire cords arranged in parallel to each other; a weft yarn woven from the tire cords; and conductive fibers in contact with the surface of the tire cords and extending along the length direction of the tire cords, wherein the conductive fibers are fibers with a metal-plated surface.

[0013] The aforementioned conductive fibers can be woven together with the aforementioned tire cords through the aforementioned weft yarns and fixed to the surface of the aforementioned tire cords.

[0014] The tire cord fabric may include 2 to 30 of the aforementioned conductive fibers.

[0015] The aforementioned conductive fiber may be made by plating gold onto the surface of a fiber selected from the group consisting of synthetic fibers, cellulose fibers and their blended yarns.

[0016] The aforementioned synthetic fibers can be selected from one of the following groups: polyester, polyamide, polyurethane, acrylic fiber, modified acrylic fiber, and their blended yarns.

[0017] The aforementioned cellulose fibers can be selected from one of the following groups: rayon, Lyocell, Tencel, and their blended yarns.

[0018] The aforementioned conductive fibers can be selected from the group consisting of filament yarns, staple fibers, and yarns.

[0019] The aforementioned spinning can be yarn with a count of 10 to 100, and the aforementioned filament yarn can be filament yarn with a denier count of 10 to 500.

[0020] Another embodiment of the present invention provides a method for preparing tire cord fabric, the method comprising: a step of preparing conductive fibers by plating gold on the surface of fibers; and a step of supplying a plurality of tire cords with warp yarns and weaving weft yarns in a manner that is woven with the tire cords, wherein, in the above-mentioned weaving step, conductive fibers are mixed into the tire cords and supplied with warp yarns, the conductive fibers being fibers with metal plating on their surface.

[0021] The above-mentioned steps for preparing conductive fibers can be achieved by electroless plating of the fiber surface with copper sulfate.

[0022] In the above-mentioned weaving steps, the conductive fibers and the tire cords are simultaneously warped and drawn.

[0023] In the drawing process of the above-mentioned weaving steps, the conductive fibers and the tire cords are supplied to the same heald, reed and dropper.

[0024] Another embodiment of the present invention provides a sheet comprising the above-described tire cord and a bonding rubber for topping.

[0025] The aforementioned bonding rubber may comprise 100 parts by weight of raw material rubber and 20 to 60 parts by weight of carbon black, wherein the raw material rubber comprises 20 to 50 parts by weight of natural rubber and 50 to 80 parts by weight of emulsion-polymerized styrene-butadiene rubber, and the aforementioned carbon black has a 29 μm... 2 / g to 39m 2The statistical adsorption layer thickness surface area (STSA) value, the oil absorption number of compressed samples (COAN) from 69 cc / 100g to 79 cc / 100g, the oil absorption number of samples (OAN) from 85 cc / 100g to 95 cc / 100g, and the iodine adsorption value from 31 mg / g to 41 mg / g are also included.

[0026] The aforementioned bonding rubber may comprise 100 parts by weight of raw material rubber, 10 to 40 parts by weight of first carbon black, and 20 to 50 parts by weight of second carbon black. The raw material rubber comprises 10 to 40 parts by weight of synthetic styrene-butadiene rubber and 60 to 90 parts by weight of natural rubber. The first carbon black has a 29 μm... 2 / g to 39m 2 The statistical adsorption layer thickness surface area value, oil absorption value of compressed samples from 69 cc / 100g to 79 cc / 100g, oil absorption value of samples from 85 cc / 100g to 95 cc / 100g, and iodine adsorption value from 31 mg / g to 41 mg / g of the second carbon black have a 70m 2 / g to 80m 2 The statistical adsorption layer thickness and surface area values, oil absorption values ​​of compressed samples from 83cc / 100g to 93cc / 100g, oil absorption values ​​of samples from 96cc / 100g to 108cc / 100g, and iodine adsorption values ​​from 76mg / g to 88mg / g were calculated.

[0027] The aforementioned sheet material can be a carcass.

[0028] Another embodiment of the present invention provides a tire comprising the above-described sheet.

[0029] The aforementioned tires can have a resistance value of 0.1MΩ to 100MΩ at a voltage of 1000V.

[0030] The effects of the invention

[0031] When the tire cord of the present invention is woven by incorporating conductive fibers into the tire cords, static electricity accumulated on the tire can be effectively released. In particular, as with the carcass cords, the conductive fibers extend radially from the bead portion to the tread portion, thereby ensuring an effective conductive path.

[0032] Therefore, since the requirements for the conductivity of the rubber composition for the tire sidewall and the rubber composition for bonding are reduced, rubber compositions with a low loss modulus (E″) for improving rolling resistance can be used. As a result, static electricity problems can be solved and fuel consumption can be improved through low rolling resistance.

[0033] Furthermore, the above-mentioned tire cord fabric preparation method involves mixing the conductive fibers into the tire cords during the existing tire cord fabric preparation process. Therefore, the existing bonding process can be applied in the same way without the need for additional equipment. Attached Figure Description

[0034] Figure 1 A perspective view of a tire cord fabric according to an embodiment of the present invention is shown for illustrative purposes.

[0035] Figure 2 for Figure 1 Cross-sectional view.

[0036] Figure 3 A half-section view of a tire according to another embodiment of the present invention is shown for illustrative purposes.

[0037] Symbol Explanation

[0038] 1: Tread section

[0039] 2: Sidewall

[0040] 3: Bead section

[0041] 4: Fetal body layer

[0042] 5: Layered

[0043] 6: Strengthen the layer

[0044] 10: Tire cords

[0045] 20: Conductive fiber

[0046] 30: Weft yarn

[0047] 100: Tire cord fabric Detailed Implementation

[0048] The embodiments of the present invention will now be described in detail to enable those skilled in the art to readily implement the invention. However, the present invention can be implemented in various different ways and is not limited to these embodiments.

[0049] One embodiment of the present invention includes a tire cord fabric comprising: a plurality of tire cords arranged in parallel to each other; a weft yarn woven from the tire cords; and conductive fibers in contact with the surface of the tire cords and extending along the length direction of the tire cords.

[0050] Figure 1 A perspective view of a tire cord fabric according to an embodiment of the present invention is shown schematically. Figure 2 for Figure 1 The cross-sectional view. Below, refer to... Figure 1 and Figure 2 This refers to the tire cord fabric 100 mentioned above.

[0051] Referring to the above Figure 1 and Figure 2 The tire cords 10 are arranged in parallel to each other. The tire cords 10 may be arranged at certain intervals or without intervals.

[0052] Any cord commonly used in tire carcasses can be used as the tire cord 10 described above. Typically, fiber cord can be used as the tire cord 10 described above.

[0053] The diameter of the tire cord 10 can be from 0.4 mm to 1.2 mm, specifically from 0.5 mm to 1.0 mm. If the diameter of the tire cord 10 is less than 0.4 mm, the strength may be too weak; if the diameter of the tire cord 10 is greater than 1.2 mm, the cut surface may be too thick.

[0054] The aforementioned weft yarn 30 is woven by weaving the tire cords 10, thereby forming the tire cord fabric 100 in woven fabric form. For example, the method of weaving the aforementioned weft yarn 30 and the aforementioned tire cords 10 is as follows: the weft yarn 30 can be arranged in the width direction perpendicular to the length direction of the aforementioned tire cords 10, and woven in a manner that alternates between vertically crossing the tire cords 10. That is, when the aforementioned weft yarn 30 passes above the first tire cord 10, the next tire cord 10 can pass below the first tire cord 10, and the returning weft yarn 30 or the next weft yarn 30 passes below the above tire cord 10 and then passes above the below tire cord 10, which can be achieved by the aforementioned first weft yarn 30 passing below the above tire cord 10 and passing above the below tire cord 10. Furthermore, the aforementioned weft yarn 30 can pass above two or more tire cords 10 and then below two or more tire cords 10, or it can pass above two or more tire cords 10 and then below only one tire cord 10. As described above, there are various methods for weaving the tire cord 10 by weaving the weft yarn 30, and there are no particular limitations in this invention.

[0055] As the aforementioned weft yarn 30, any weft yarn capable of weaving the aforementioned tire cord 10 is acceptable. For example, the aforementioned weft yarn 30 can be selected from the group consisting of natural fibers, synthetic fibers, and their blended yarns. Specifically, it can be cotton yarn, rayon yarn (rich fiber yarn), or covered yarn made by covering unstretched yarns such as nylon or polyester with cotton short fibers or rayon short fibers, etc., but the present invention is not limited to these.

[0056] The conductive fiber 20 is in contact with the surface of the tire cord 10 and extends along the length of the tire cord 10. In this invention, one conductive fiber 20 may be in contact with the surfaces of multiple tire cords 10, but as described above... Figure 1 As shown, a conductive fiber 20 may be in contact with the surface of only one tire cord 10 and may extend only along the in contact tire cord 10.

[0057] Furthermore, as mentioned above Figure 1 and Figure 2 As shown, the conductive fiber 20 can be woven together with the tire cord 10 through the weft yarn 30 and fixed to the surface of the tire cord 10.

[0058] At this time, the conductive fiber 20 may be located on only one side of the tire cord 100, or it may be alternately located on both sides of the tire cord 100. Furthermore, the conductive fiber 20 may be located between the tire cords 10, and in this case, independently of the tire cords 10, the conductive fiber 20 may be woven using the weft yarn 30. That is, the weft yarn 30 may alternately cross the tire cords 10 and the conductive fiber 20.

[0059] Furthermore, when the diameter of the conductive fiber 20 is sufficiently small compared to the diameter of the tire cord 10, the conductive fiber 20 is located in the valley formed between the tire cord 10 and the tire cord 10, so that the conductive fiber 20 does not protrude from the surface of the tire cord 100, thus the surface is not uneven, and the conductive fiber 20 can have a thickness approximately equal to the diameter of the tire cord 10.

[0060] On the other hand, the conductive fiber 20 can be made conductive by plating gold on its surface. Specifically, the conductive fiber 20 can be made by plating gold on the surface of a fiber selected from the group consisting of synthetic fibers, cellulose fibers, and their blended yarns.

[0061] The aforementioned synthetic fibers may be selected from the group consisting of polyester, polyamide, polyurethane, acrylic fiber, modified acrylic fiber, and their blended yarns. The aforementioned cellulose fibers may be selected from the group consisting of rayon, Lyocell, Tencel, and their blended yarns.

[0062] Furthermore, the conductive fiber 20 can be selected from the group consisting of filament yarn, staple fiber, and yarn. That is, the conductive fiber 20 can be made from filament yarn as is, or from staple fiber through texture processing, or from yarn spun from the aforementioned textured staple fiber.

[0063] Considering ease of manufacture, tire durability, and conductivity, the diameter of the conductive fiber 20 can be from 0.05 mm to 0.5 mm. When the conductive fiber 20 is a spun yarn, the yarn can be a yarn with a count of 10 to 100. When the conductive fiber 20 is a filament yarn, the filament yarn can be a filament yarn with a denier of 10 to 500 denier. The aforementioned yarn count includes cotton yarn count, wool yarn count, and linen yarn count. For cotton yarn count, if the cotton yarn weighs 1 pound (453 grams) and has a length of 840 yards (768 meters), it is defined as yarn count 1. For wool yarn count, if the wool yarn weighs 1 gram and has a length of 1 km, it is defined as yarn count 1. For linen yarn count, if the linen yarn weighs 1 pound (453 grams) and has a length of 300 yards (274 meters), it is defined as yarn count 1. Furthermore, for denier count, if 9000 meters of filament yarn is used as a base and 1 gram is defined as 1 denier, it is defined as 1 denier. If the diameter of the conductive fiber 20 is less than 0.05 mm, the yarn count is less than 10 (′S), and the denier is less than 10, the lack of tensile strength may be detrimental to processability. If the diameter of the conductive fiber 20 is greater than 0.05 mm, the yarn count is greater than 100 (′S), and the denier is greater than 500, the excessive thickness may cause it to become a foreign object inside the tire.

[0064] Considering electrostatic performance, the more conductive fibers 20 the better. However, since conductive fibers 20 are expensive, increasing unit cost, and they may exist as foreign objects inside the tire, the desired purpose can be considered achieved as long as the conductive fibers 20 can impart minimal conductivity to the tire (resistance less than 100 MΩ). Therefore, considering the conductivity utility and cost of the tire, the conductive fibers 20 can be arranged at intervals of 20 mm to 400 mm, specifically 50 mm to 300 mm. When the interval of the conductive fibers 20 is less than 20 mm, it is economically inefficient, and the tire's durability may be reduced because the conductive fibers 20 become foreign objects inside the tire. When the interval of the conductive fibers 20 is greater than 400 mm, the required level of conductivity may not be guaranteed.

[0065] Furthermore, the tire cord 100 may include 2 to 30 of the aforementioned conductive fibers 20. If the number of conductive fibers 20 is less than 2, each tire produced will include only one conductive fiber 20, thus failing to ensure conductivity. If the number of conductive fibers 20 is greater than 30, the economic efficiency will be low, and the excessive number may cause problems with tire durability.

[0066] A method for preparing tire cord fabric according to another embodiment of the present invention includes: a step of preparing conductive fibers by plating gold on the surface of fibers; and a step of supplying a plurality of tire cords with warp yarns and weaving weft yarns in a manner that is similar to the tire cords.

[0067] First, conductive fibers are prepared by plating gold onto the fiber surface.

[0068] Conductive fibers with metal plated on the above-mentioned surface can be prepared by immersing a fiber selected from the group consisting of synthetic fibers, cellulose fibers and their blended yarns into an electrolyte containing metal salts and then electroplating or electroless plating, or by plating gold on the surface of the above-mentioned fibers by physical vapor deposition or chemical vapor deposition.

[0069] The contents regarding the fiber selected from the group consisting of synthetic fibers, cellulose fibers and their blended yarns, and the metal mentioned above are as described above, and therefore repeated explanations will be omitted.

[0070] However, for example, copper-plated fibers on the aforementioned surface can be prepared by immersing a fiber selected from the group consisting of synthetic fibers, cellulose fibers and their blended yarns in an electrolyte containing a metal salt such as copper sulfate, and then performing electroless plating.

[0071] The conductive fibers prepared described above can be used directly in textile processes as described above, or selectively used in textile processes after being textured in various ways. When the conductive fibers with metal-plated surfaces are textured, their bulky nature increases the bonding area with rubber, which may contribute to conductivity. Furthermore, when textiles are woven after texturing, after preparing slivers through carding and combing, it is not possible to weave even filaments with strong straightness after cutting them to a certain length. Therefore, texturing can impart crimp, allowing for smooth weaving.

[0072] The aforementioned texturing methods can all utilize commonly known techniques such as the false-twist method, the stuffer-box method, or the air-jet texturing method. Among these, the false-twist method is representatively applicable, while the stuffer-box method can be appropriately used in the case of thermoplastic fibers.

[0073] The conductive fibers with the above-mentioned textured finish are cut into lengths of 1cm to 5cm to prepare staple fibers, which can then be spun using various methods such as ring spinning, air jet spinning, and open end spinning.

[0074] Next, multiple tire cords are supplied with warp yarns, and weft yarns are woven in in a manner that is similar to the tire cords, thereby preparing the tire cord fabric.

[0075] At this point, conductive fibers are mixed into the tire cords and supplied as warp yarns. Except for mixing the conductive fibers into the tire cords and supplying them as warp yarns during the conventional preparation of tire cord fabric, the method for preparing the tire cord fabric can be the same as existing methods for preparing tire cord fabrics.

[0076] Specifically, the aforementioned weaving steps may include yarn winding, warping, threading, and weaving. More specifically, the yarn winding process is the process of rewinding tire cords supplied in various forms; the warping process is the process of arranging each of the tire cords (warp yarns) in parallel and winding them onto the warp beam with a certain tension to supply the tire cords (warp yarns) to the loom; the threading process is the process of inserting the tire cords into the tire cords in the order of healds, reeds, and droppers according to the fabric design conditions; and the weaving process is the process of weaving the weft yarns between the tire cords to prepare the fabric with the desired weave.

[0077] At this point, the conductive fibers are mixed into the tire cord as warp yarns, so that the conductive fibers are woven together with the tire cord through the weft yarns and fixed to the surface of the tire cord. For this purpose, the conductive fibers can be warped and / or drawn together with the tire cord. Specifically, in the warping process, the conductive fibers are creeled together with the tire cord; in the drawing process, the conductive fibers and the tire cord are supplied to the same heals, reeds, and droppers, so that the conductive fibers and the tire cord are woven together through the weft yarns.

[0078] The aforementioned conductive fibers can be fed through the same warp threads as the aforementioned tire cords at intervals of 5cm to 70cm, with a weaving width of 1450cm to 1700cm based on the aforementioned reed. The aforementioned bundling can be done on the same shaft, or it can be inserted after a separate bundling frame shaft, so that the aforementioned conductive fibers are woven through the heddles and reeds in the same compartment.

[0079] Subsequently, the prepared tire cord fabric raw material (grey fabric) can be heat-treated to set its final physical properties and coated with a dip solution to produce a heat-treated fabric (dipped fabric).

[0080] According to another embodiment of the present invention, the sheet material includes the above-mentioned tire cord and bonding rubber for topping the tire cord.

[0081] The aforementioned adhesive rubber surrounds one or both sides of the aforementioned tire cord and penetrates between the aforementioned tire cord to form the aforementioned sheet.

[0082] For example, the sheet material described above can be any sheet material used for tires and including tire cords bonded with the aforementioned bonding rubber. For example, it can be a tire carcass, but the present invention is not limited thereto.

[0083] Because the aforementioned sheet effectively releases static electricity accumulated on the tire, a tire including the aforementioned sheet can have a resistance value of 0.1 MΩ to 100 MΩ at a voltage of 1000 V. To achieve a resistance value of less than 0.1 MΩ at 1000 V, many other tradeoffs exist, such as the additional application of electrifying compounds or excessive use of conductive fibers, which may negatively impact rolling resistance (LRR). Furthermore, if the tire has a resistance value greater than 100 MΩ at 1000 V, it may be unable to release static electricity from the tire.

[0084] The aforementioned sheet material can effectively release static electricity accumulated on the tire. In particular, like the tire carcass cord, the aforementioned conductive fibers extend radially from the bead portion to the tread portion, thereby ensuring an effective conductive path.

[0085] Therefore, by imparting conductivity to components other than the rubber composition, the freedom to develop low rolling resistance (LRR) in the carcass bonding rubber composition and the sidewall rubber composition can be increased. In other words, since the need for conductivity in the aforementioned sidewall rubber composition and the aforementioned carcass bonding rubber composition is reduced, rubber compositions for improving rolling resistance can be applied. As a result, by applying the aforementioned conductive fibers, tires with improved fuel economy and low rolling resistance that eliminate static electricity problems can be produced.

[0086] Therefore, any bonding rubber commonly used in textile cords for tires can be used as the bonding rubber described above. However, the bonding rubber can have an excellent LRR (Low Resistance Ratio) composition, namely, comprising 100 parts by weight of raw rubber and 20 to 60 parts by weight of carbon black with large particle size and a less developed structure. The raw rubber comprises 20 to 50 parts by weight of natural rubber and 50 to 80 parts by weight of emulsion-polymerized styrene-butadiene rubber. When the bonding rubber has the composition described above, the inclusion of styrene-butadiene rubber is beneficial for adhesion, and the use of carbon black with a less developed structure reduces internal heat and improves rolling resistance. Furthermore, the lower weight of carbon black results in lower heat generation, making it preferable. Even if the tire includes the bonding rubber with the above composition, the tire can have a resistance value of 0.1 MΩ to 100 MΩ at a voltage of 1000 V due to the inclusion of the sheet material. The carbon black with large particle size and a less developed structure can have a particle size of 29 μm. 2 / g to 39m 2The statistical adsorption layer thickness and surface area values ​​per g, the oil absorption values ​​of compressed samples from 69cc / 100g to 79cc / 100g, the oil absorption values ​​of samples from 85cc / 100g to 95cc / 100g, and the carbon black iodine adsorption values ​​from 31mg / g to 41mg / g.

[0087] Nevertheless, the aforementioned bonding rubber can be an electrically conductive bonding rubber composition to further improve the conductivity of the aforementioned sheet. The aforementioned electrically conductive bonding rubber composition may have the following composition: comprising 100 parts by weight of raw material rubber, 10 to 40 parts by weight of a first carbon black with relatively large particle size and relatively less developed structure, and 20 to 50 parts by weight of a second carbon black with relatively small particle size and relatively more developed structure. The aforementioned raw material rubber comprises 10 to 40 parts by weight of synthetic styrene-butadiene rubber and 60 to 90 parts by weight of natural rubber. The aforementioned first carbon black with relatively large particle size and relatively less developed structure may have a particle size of 29 μm. 2 / g to 39m 2 The carbon black with statistical adsorption layer thickness and surface area values ​​of / g, oil absorption values ​​of compressed samples of 69cc / 100g to 79cc / 100g, oil absorption values ​​of samples of 85cc / 100g to 95cc / 100g, and iodine adsorption values ​​of 31mg / g to 41mg / g, while the aforementioned second carbon black with relatively small particle size and relatively more developed structure can be 70m 2 / g to 80m 2 The statistical adsorption layer thickness and surface area values ​​per g, the oil absorption values ​​of compressed samples from 83cc / 100g to 93cc / 100g, the oil absorption values ​​of samples from 96cc / 100g to 108cc / 100g, and the carbon black with iodine adsorption values ​​from 76mg / g to 88mg / g.

[0088] Furthermore, the aforementioned sidewall rubber can utilize a rubber composition with low electrical conductivity and low rolling resistance. The sidewall rubber can have the following composition: comprising 100 parts by weight of raw rubber and 20 to 70 parts by weight of carbon black with large particle size and a less developed structure. The raw rubber comprises 30 to 70 parts by weight of natural rubber and 30 to 70 parts by weight of synthetic butadiene rubber. When the sidewall rubber has the composition described above, heat generation is reduced, resulting in excellent fuel efficiency, and is therefore preferred. Even if the tire includes a sidewall rubber with the above composition, the tire can still have a resistance value of 0.1 MΩ to 100 MΩ at a voltage of 1000 V due to the inclusion of the aforementioned sheet material. The aforementioned carbon black with large particle size and a less developed structure can have a 29 μm... 2 / g to 39m 2The statistical adsorption layer thickness and surface area values ​​per g, the oil absorption values ​​of compressed samples from 69cc / 100g to 79cc / 100g, the oil absorption values ​​of samples from 85cc / 100g to 95cc / 100g, and the carbon black iodine adsorption values ​​from 31mg / g to 41mg / g.

[0089] On the other hand, the aforementioned sidewall rubber can be an electrically conductive bonded rubber composition to further improve the conductivity of the sheet. The aforementioned electrically conductive sidewall rubber composition can have the following composition: 100 parts by weight of raw material rubber, 10 to 40 parts by weight of a first carbon black with relatively large particle size and relatively less developed structure, and 10 to 30 parts by weight of a third carbon black with relatively small particle size and relatively more developed structure. The raw material rubber includes 30 to 70 parts by weight of natural rubber and 30 to 70 parts by weight of synthetic butadiene rubber. The aforementioned first carbon black with relatively large particle size and relatively less developed structure can have a particle size of 29 μm. 2 / g to 39m 2 The statistical adsorption layer thickness and surface area values, oil absorption values ​​of compressed samples from 69 cc / 100g to 79 cc / 100g, oil absorption values ​​of samples from 85 cc / 100g to 95 cc / 100g, and iodine adsorption values ​​of carbon black from 31 mg / g to 41 mg / g are all relevant data. The aforementioned third carbon black, with its relatively small particle size and more developed structure, can have a particle size of 118 μm. 2 / g to 129m 2 The statistical adsorption layer thickness and surface area values, oil absorption values ​​of compressed samples from 91cc / 100g to 101cc / 100g, oil absorption values ​​of samples from 108cc / 100g to 118cc / 100g, and carbon black with iodine adsorption values ​​from 150mg / g to 165mg / g.

[0090] The sheet material can be prepared by bonding the tire cord with the aforementioned bonding rubber, followed by calendering and cutting. In this case, if the tire cord is made of the aforementioned raw material (grey fabric), it is prepared using a heat treatment machine; or if the tire cord is made of a heat-treated material (dipped fabric), the sheet material is prepared using a conventional calendering process. In other words, the tire cord can be prepared using the existing bonding process without requiring additional equipment.

[0091] A tire according to another embodiment of the present invention comprises the above-described sheet material. Figure 3 A half-section view of the tire described above is shown schematically. Below, referring to the above... Figure 3 The above-mentioned tires will be described.

[0092] The tire described above includes a tread portion 1, a sidewall portion 2, and a bead portion 3. A carcass layer 4 is provided between the pair of left and right bead portions 3, and the two ends of the carcass layer 4 in the tire width direction are rolled up from the inside of the tire to the outside of the bead portion 3 around its periphery. A belt layer 5 and a reinforcing belt layer 6 are provided on the outside of the carcass layer 4, and an inner liner (not shown in the figure) is provided on the inside of the carcass layer 4.

[0093] At this time, the sheet material according to the present invention can be applied to the carcass layer 4, thereby effectively releasing the static electricity accumulated on the tire. In particular, as with the carcass layer 4, the tire cord extends from the bead portion to the tread portion in the radial direction, thereby ensuring an effective conductive channel.

[0094] On the other hand, preferably, the tire described above can be a general passenger car tire, but the present invention is not limited thereto. The tire described above can include tires for passenger cars, light truck tires, high-performance tires, SUV tires, off-road tires, bias-ply truck tires, or bias-ply bus tires, etc. Furthermore, the tire described above can be a radial tire or a bias-ply tire.

[0095] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily implement the present invention. The present invention can be implemented through various different methods and is not limited to the embodiments described in this specification.

[0096] (Examples 1 to 8 and Comparative Examples 1 to 2)

[0097] As shown in Tables 1 and 2 below, tire specification 225 / 45R17 was selected. In Comparative Examples 1 to 2, conductive fibers were not used to prepare the tire carcass, while in Examples 1 to 8, copper-plated conductive fibers were woven to prepare the tire carcass.

[0098] Specifically, the tire cord fabric according to the embodiments is prepared as follows.

[0099] Acrylic long fibers or N66 long fibers are immersed in copper sulfate electrolyte and then electroless plated to prepare copper-plated conductive fibers. The conductive fibers mentioned above are 200 denier filament fibers.

[0100] In the textile fabric of tire cords, the aforementioned conductive fibers are mixed with the tire cords as warp yarns. Specifically, the conductive fibers are fed into the fabric at intervals of 10cm, 20cm, and 30cm along a 165cm weaving width (based on the reed), using the same warp yarns as the tire cords. After inserting the conductive fibers into a separate bundler shaft, they are passed through heddles and reeds at the same intervals as the tire cords. The tire cords are made of 0.68mm diameter PET 1500D / 2, and the weft yarns are 250 denier nylon-covered yarns.

[0101] After the greige fabric was first impregnated with epoxy resin, it was dried at 145°C under appropriate tension for 5 minutes, followed by a second impregnation with a resorcinol-formaldehyde latex (RFL) solution, dried at 145°C for 5 minutes, and then heat-treated at 245°C under appropriate tension for 5 minutes in a continuous process. The prepared impregnated fabric cord was calendered using a four-bowl calender and a bonding rubber composition. The calendered sheet was then cut at a 90-degree angle according to the tire size.

[0102] Table 1

[0103]

[0104] 1) Carcass bonding rubber composition: a general non-electric rubber composition comprising 100 parts by weight of raw material rubber and 70 parts by weight of carbon black with large particle size and underdeveloped structure, wherein the raw material rubber comprises 30 parts by weight of synthetic styrene-butadiene rubber and 70 parts by weight of natural rubber. The aforementioned carbon black with large particle size and underdeveloped structure has a particle size of 34 μm. 2 The statistical adsorption layer thickness and surface area value / g, the oil absorption value of the compressed sample of 74cc / 100g, the oil absorption value of the sample of 90cc / 100g, and the carbon black with an iodine adsorption value of 36mg / g.

[0105] 2) Sidewall rubber composition: a general non-electric rubber composition comprising 100 parts by weight of raw material rubber and 70 parts by weight of carbon black with large particle size and underdeveloped structure, wherein the raw material rubber comprises 70 parts by weight of natural rubber and 30 parts by weight of synthetic butadiene rubber. The aforementioned carbon black with large particle size and underdeveloped structure has a particle size of 34 μm. 2 The statistical adsorption layer thickness and surface area value / g, the oil absorption value of the compressed sample of 74cc / 100g, the oil absorption value of the sample of 90cc / 100g, and the carbon black with an iodine adsorption value of 36mg / g.

[0106] - Sidewall rubber composition (electrically conductive rubber composition): A rubber composition exhibiting excellent electrical conductivity, comprising 100 parts by weight of raw rubber, 30 parts by weight of a first carbon black with relatively large particle size and relatively less developed structure, and 20 parts by weight of a third carbon black with relatively small particle size and relatively more developed structure. The raw rubber comprises 70 parts by weight of natural rubber and 30 parts by weight of synthetic butadiene rubber. The first carbon black with relatively large particle size and relatively less developed structure has a particle size of 34 μm. 2 The carbon black has a statistical adsorption layer thickness and surface area value of / g, an oil absorption value of 74cc / 100g for compressed samples, an oil absorption value of 90cc / 100g for samples, and an iodine adsorption value of 36mg / g. The third carbon black, with a relatively small particle size and a relatively more developed structure, has a particle size of 123m. 2 The statistical adsorption layer thickness and surface area values, the oil absorption value of the compressed sample (96cc / 100g), the oil absorption value of the sample (113cc / 100g), and the carbon black with an iodine adsorption value of 160mg / g.

[0107] Table 2

[0108]

[0109] 1) Carcass bonding rubber composition (LRR rubber composition): An LRR rubber composition comprising 100 parts by weight of raw material rubber and 30 parts by weight of carbon black with large particle size and low structural development. The raw material rubber comprises 70 parts by weight of emulsion-polymerized styrene-butadiene rubber and 30 parts by weight of natural rubber. The aforementioned carbon black with large particle size and low structural development has a particle size of 34 μm. 2 The statistical adsorption layer thickness and surface area value / g, the oil absorption value of the compressed sample of 74cc / 100g, the oil absorption value of the sample of 90cc / 100g, and the carbon black with an iodine adsorption value of 36mg / g.

[0110] 2) Sidewall Rubber Composition (LRR Rubber Composition): This LRR rubber composition comprises 100 parts by weight of raw rubber and 50 parts by weight of carbon black filler with large particle size and a less developed structure. The raw rubber comprises 50 parts by weight of natural rubber and 50 parts by weight of synthetic butadiene rubber. The aforementioned carbon black with large particle size and a less developed structure has a particle size of 34 μm. 2 The statistical adsorption layer thickness and surface area value / g, the oil absorption value of the compressed sample of 74cc / 100g, the oil absorption value of the sample of 90cc / 100g, and the carbon black with an iodine adsorption value of 36mg / g.

[0111] [Experimental Example 1]

[0112] The electrical conductivity and durability of the tires prepared in the above examples and comparative examples were measured, and the results are shown in Tables 3 and 4 below.

[0113] Table 3

[0114]

[0115] Table 4

[0116]

[0117] In Tables 3 and 4 above, the resistance was measured by applying a voltage of 1000V to the contact patch and rim of the tire, and the high-speed durability, general durability, and long-term durability were determined under conditions of 140% load index and 80 km / h. The rolling resistance (RRc) was measured using the ISO 20580 method, with Comparative Example 1 set to 100; a lower value indicates better performance.

[0118] Referring to Tables 3 and 4 above, in the cases of Examples 1 to 3, the resistance was lower than that of Comparative Example 1, and the power-carrying performance was improved. However, it can be confirmed by the durability and rolling resistance (RR) tests that there was no change in durability and rolling resistance.

[0119] On the other hand, in Comparative Examples 1 and 2, the difference in electrical conductivity when conductive fibers are absent can be confirmed based on the type of carcass bonding rubber composition and sidewall bonding rubber composition. It can be confirmed that in Examples 3 to 6 above, even when the LRR rubber composition is used in both the carcass bonding rubber composition and the sidewall rubber composition, the resistance is reduced by applying the aforementioned tire cord, thereby improving electrical conductivity. Furthermore, it can be confirmed that Examples 3 to 6 achieve improved fuel consumption by eliminating static electricity problems and reducing rolling resistance through the application of the LRR rubber composition.

[0120] The above description exemplifies the present invention, and those skilled in the art should not deviate from the basic characteristics of the invention to make different modifications or alterations. Therefore, the embodiments disclosed in this specification are not intended to limit the invention, but rather to describe it, and the spirit and scope of the invention should not be limited to the described embodiments. The scope of protection of the invention should be determined by the claims, and all interpretations of the technical spirit within the equivalent scope should fall within the scope of the invention.

[0121] The present invention also provides the following technical solutions:

[0122] Note 1. A tire cord fabric, characterized in that it comprises:

[0123] Multiple tire cords are arranged in parallel to each other;

[0124] The weft yarn is woven using the aforementioned tire cord; and

[0125] Conductive fibers are in contact with the surface of the tire cords and extend along the length of the tire cords.

[0126] The aforementioned conductive fibers are fibers with metal-plated surfaces.

[0127] Note 2. The tire cord fabric according to Note 1 is characterized in that the conductive fibers can be woven together with the tire cord through the weft yarn and fixed to the surface of the tire cord.

[0128] Note 3. The tire cord fabric according to Note 1, characterized in that the tire cord fabric comprises 2 to 30 of the aforementioned conductive fibers.

[0129] Note 4. The tire cord fabric according to Note 1 is characterized in that the conductive fiber is formed by gold plating on the surface of a fiber selected from the group consisting of synthetic fibers, cellulose fibers and their blended yarns.

[0130] Note 5. The tire cord fabric according to Note 4 is characterized in that the synthetic fiber is selected from the group consisting of polyester, polyamide, polyurethane, acrylic fiber, modified acrylic fiber and their blended yarns.

[0131] Note 6. The tire cord fabric according to Note 4 is characterized in that the cellulose fiber is selected from the group consisting of rayon, Lyocell, Tencel and their blended yarns.

[0132] Note 7. The tire cord fabric according to Note 4 is characterized in that the conductive fiber is selected from the group consisting of filament yarn, staple fiber and yarn.

[0133] Note 8. The tire cord fabric according to Note 7 is characterized in that the yarn is a yarn with a count of 10 to 100, and the filament yarn is a filament yarn with a denier of 10 to 500.

[0134] Note 9. A method for preparing tire cord fabric, characterized in that it comprises:

[0135] The steps for preparing conductive fibers by plating gold onto the fiber surface; and

[0136] The process involves supplying multiple tire cords with warp yarns and weaving weft yarns in a manner similar to weaving the tire cords together.

[0137] In the aforementioned weaving steps, conductive fibers are mixed into the tire cords to supply the warp yarns.

[0138] The aforementioned conductive fibers are fibers with metal-plated surfaces.

[0139] Note 10. The method for preparing tire cord fabric according to Note 9, characterized in that,

[0140] The above-mentioned steps for preparing conductive fibers are achieved by electroless plating of copper sulfate salt on the surface of the fibers.

[0141] Note 11. The method for preparing tire cord fabric according to Note 9 is characterized in that, in the above-mentioned weaving steps, the conductive fibers and the tire cords are simultaneously warped and threaded.

[0142] Note 12. The method for preparing tire cord fabric according to Note 9 is characterized in that, in the warp-threading process of the above-mentioned weaving steps, the conductive fibers and the tire cord are supplied to the same heddles, reeds and stop-warp sheets.

[0143] Note 13. A sheet material, characterized in that it comprises tire cord fabric as described in any one of Notes 1 to 8 and bonding rubber for bonding the tire cord fabric.

[0144] Note 14. The sheet according to Note 13, characterized in that,

[0145] The aforementioned bonding rubber comprises 100 parts by weight of raw material rubber and 20 to 60 parts by weight of carbon black, wherein the raw material rubber comprises 20 to 50 parts by weight of natural rubber and 50 to 80 parts by weight of emulsion-polymerized styrene-butadiene rubber, and the aforementioned carbon black has a 29 μm... 2 / g to 39m 2 The statistical adsorption layer thickness and surface area values, oil absorption values ​​of compressed samples from 69cc / 100g to 79cc / 100g, oil absorption values ​​of samples from 85cc / 100g to 95cc / 100g, and iodine adsorption values ​​from 31mg / g to 41mg / g were calculated.

[0146] Note 15. The sheet according to Note 13, characterized in that,

[0147] The aforementioned bonding rubber comprises 100 parts by weight of raw material rubber, 10 to 40 parts by weight of first carbon black, and 20 to 50 parts by weight of second carbon black. The raw material rubber comprises 10 to 40 parts by weight of synthetic styrene-butadiene rubber and 60 to 90 parts by weight of natural rubber. The first carbon black has a 29 μm... 2 / g to 39m 2 The statistical adsorption layer thickness surface area value, oil absorption value of compressed samples from 69 cc / 100g to 79 cc / 100g, oil absorption value of samples from 85 cc / 100g to 95 cc / 100g, and iodine adsorption value from 31 mg / g to 41 mg / g of the second carbon black have a 70m 2 / g to 80m 2The statistical adsorption layer thickness and surface area values, oil absorption values ​​of compressed samples from 83cc / 100g to 93cc / 100g, oil absorption values ​​of samples from 96cc / 100g to 108cc / 100g, and iodine adsorption values ​​from 76mg / g to 88mg / g were calculated.

[0148] Note 16. The sheet material according to Note 13 is characterized in that the sheet material is a substrate.

[0149] Note 17. A tire, characterized in that it comprises the sheet material described in Note 13. Note 18. The tire according to Note 17, characterized in that the tire has a resistance value of 0.1 MΩ to 100 MΩ at a voltage of 1000 V.

Claims

1. A tire cord fabric, comprising: Multiple tire cords are arranged in parallel to each other; The weft yarn is woven together with the aforementioned tire cord yarn for weaving operations; and Conductive fibers are in contact with the surface of the tire cords and extend along the length of the tire cords. The aforementioned conductive fibers are fibers with a metal-plated surface. Each of the tire cords and the conductive fibers are arranged parallel to each other, and One of the aforementioned conductive fibers is in contact with the surface of only one of the aforementioned tire cords and extends only along the contacted tire cords.

2. The tire cord fabric according to claim 1, wherein, The conductive fibers are woven together with the tire cords through the weft yarns and fixed to the surface of the tire cords.

3. The tire cord fabric according to claim 1, wherein, The aforementioned tire cord fabric includes 2 to 30 of the aforementioned conductive fibers.

4. The tire cord fabric according to claim 1, wherein, The aforementioned conductive fiber is made by plating a metal onto the surface of a fiber selected from the group consisting of synthetic fibers, cellulose fibers, and their blended yarns.

5. The tire cord fabric according to claim 4, wherein, The aforementioned synthetic fibers are selected from any one of the group consisting of polyester, polyimide, polyurethane, acrylic fiber, modified acrylic fiber, and their blended yarns.

6. The tire cord fabric according to claim 4, wherein, The aforementioned cellulose fiber is selected from one of the groups consisting of rayon, Lyocell, Tencel, and their blended yarns.

7. The tire cord fabric according to claim 4, wherein, The aforementioned conductive fiber is selected from the group consisting of filament yarn, staple fiber, and spinning.

8. The tire cord fabric according to claim 7, wherein, The above-mentioned spinning is yarn with a count of 10 to 100, and the above-mentioned filament yarn is filament yarn with a denier of 10 to 500.

9. A method for preparing tire cord fabric, wherein, include: The steps for preparing conductive fibers by plating metal onto the fiber surface; and The process involves supplying multiple tire cords with warp yarns and weaving weft yarns in a manner similar to weaving the tire cords together. In the aforementioned weaving steps, conductive fibers are mixed into the tire cords to supply them as warp yarns, and each conductive fiber contacts only the surface of one tire cord and extends only along the contacted tire cord. The aforementioned conductive fibers are fibers with metal-plated surfaces, and Each of the tire cords and the conductive fibers are arranged parallel to each other.

10. The method for preparing tire cord fabric according to claim 9, wherein, The above-mentioned steps for preparing conductive fibers are achieved by electroless plating of copper sulfate salt on the surface of the fibers.

11. The method for preparing tire cord fabric according to claim 9, wherein, In the above-mentioned weaving steps, the conductive fibers and the tire cords are simultaneously warped and threaded.

12. The method for preparing tire cord fabric according to claim 9, wherein, In the warping process of the above-mentioned weaving steps, the conductive fibers and the tire cords are supplied to the same heddles, reeds and stop-warp sheets.

13. A sheet comprising tire cord fabric as described in any one of claims 1 to 8 and bonding rubber for bonding said tire cord fabric.

14. The sheet according to claim 13, wherein, The aforementioned bonding rubber comprises 100 parts by weight of raw material rubber and 20 to 60 parts by weight of carbon black, wherein the raw material rubber comprises 20 to 50 parts by weight of natural rubber and 50 to 80 parts by weight of emulsion-polymerized styrene-butadiene rubber, and the aforementioned carbon black has a 29 μm... 2 / g to 39m 2 The statistical adsorption layer thickness and surface area values, oil absorption values ​​of compressed samples from 69cc / 100g to 79cc / 100g, oil absorption values ​​of samples from 85cc / 100g to 95cc / 100g, and iodine adsorption values ​​from 31mg / g to 41mg / g were calculated.

15. The sheet according to claim 13, wherein, The aforementioned bonding rubber comprises 100 parts by weight of raw material rubber, 10 to 40 parts by weight of first carbon black, and 20 to 50 parts by weight of second carbon black. The raw material rubber comprises 10 to 40 parts by weight of synthetic styrene-butadiene rubber and 60 to 90 parts by weight of natural rubber. The first carbon black has a 29 μm... 2 / g to 39m 2 The statistical adsorption layer thickness surface area value, oil absorption value of compressed samples from 69 cc / 100g to 79 cc / 100g, oil absorption value of samples from 85 cc / 100g to 95 cc / 100g, and iodine adsorption value from 31 mg / g to 41 mg / g of the second carbon black have a 70m 2 / g to 80m 2 The statistical adsorption layer thickness and surface area values, oil absorption values ​​of compressed samples from 83cc / 100g to 93cc / 100g, oil absorption values ​​of samples from 96cc / 100g to 108cc / 100g, and iodine adsorption values ​​from 76mg / g to 88mg / g were calculated.

16. The sheet according to claim 13, wherein, The aforementioned sheet material is the substrate.

17. A tire, wherein, Includes the sheet material as described in claim 13.

18. The tire according to claim 17, wherein, The aforementioned tires have a resistance value of 0.1MΩ to 100MΩ at a voltage of 1000V.

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