KR20050051104A - Hybrid dip cord - Google Patents

Abstract

The present invention (A) step of weaving while intertwining the polyethylene terephthalate yarn and polyethylene naphthalate yarn, and then winding, B) to give the twisted yarn twisted yarn to produce a lower twisted yarn, the lower twisted yarn two or three The present invention provides a hybrid deep cord having a high utilization efficiency, which is manufactured by a method comprising the step of preparing a raw cord by adding staging to the bone, and c) dipping the raw cord into a dipping liquid.

Description

Hybrid dip cord

In recent years, the performance of tires has been continuously improved according to the improvement of the road environment and the performance of the vehicle, and in particular, it is recognized that safety is more important as the quality of the tire as the weight of the vehicle increases and the limit speed increases. In line with the demand for increasing tire safety, tire safety standards are also changing, and the tire industry is actively researching methods for providing tire safety.

In the first pneumatic tires, cotton canvas was used as a carcass material. With the development of artificial fibers, fiber cords such as rayon, nylon, and polyethylene terephthalate have been used as materials for carcass plies. Cords are used.

In general, polyethylene terephthalate is commonly used as a carcass ply material of pneumatic radial tires, and more specifically, pneumatic radial tires having a flat ratio of 0.65 to 0.82. Background Art Rayon is relatively used as a carcass ply reinforcement for pneumatic radial tires.

Recently, polyethylene naphthalate is used in some of these high-speed, low-flat ratio radial tires. However, the high-temperature properties and shape stability are superior to polyethylene terephthalate.

In addition, since general rayon has disadvantages in terms of production method, physical properties, and tire production process, there are many limitations in applying it to general radial tires. In general, the existing rayon is produced using an indirect substitution method, and there are many problems due to the complex manufacturing process and environmental impact. Therefore, in light of recent trends that consider the impact on the environment, there are many problems. In addition, in terms of physical properties, the wet strength is too low to be inadequate as a tire cord, and when applied to a tire, the strength is lowered due to moisture penetration due to cracks or cuts in the tread portion, thereby deteriorating the durability of the tire. In addition, there was a problem that the moisture content should be adjusted to 2% or less during tire production.

In addition, US Patent No. 661378 proposes a hybrid cord manufactured by twisting one wound yarn of polyethylene terephthalate and polyethylene naphthalate. Polyethylene naphthalate fibers have a significantly higher modulus than polyethylene terephthalate fibers. Due to this difference in properties, polyethylene terephthalate and polyethylene naphthalate yarns cause uneven tension in the raw cord when each yarn is wound. In other words, relatively high tension is applied to polyethylenenaphthalate yarn having a high modulus. Due to this problem, the strong utilization rate during the continuous shooting and dipping is sharply lowered.

Therefore, the present invention was invented to solve the above problems (A) step of weaving after weaving while interlocking polyethylene terephthalate yarn and polyethylene naphthalate yarn, (B) by applying twist to the yarn Preparing a twisted yarn, adding the lower twisted yarn into two or three yarns, adding upper edge to prepare a raw cord, and (C) immersing the raw cord in a dipping solution to prepare the method. The purpose of the hybrid deep cord for radial tires is to improve morphological stability, which is a disadvantage of polyethylene terephthalate fiber, and to provide a hybrid deep cord for tires having excellent strength and high temperature properties.

The present invention comprises the steps of (A) polyethylene terephthalate yarn and polyethylenenaphthalate yarn entangled with each other and then winding up, (B) imparting twist to the spliced yarn to produce a lower twisted yarn, the lower twisted yarn two or Synthesis into three copies to add a staging to produce a raw cord, (C) provides a hybrid deep cord prepared by the method comprising the step of immersing the raw cord in a dipping solution.

In addition, it is preferable that the polyethylene terephthalate yarn and polyethylene naphthalate yarn are weaved while interlacing with each other at a ratio of 0.5 to 2: 1.

In addition, the mutual interlocking of the yarns is made on the interlace nozzle, wherein the air pressure of the interlace is preferably 0.5 to 4.0 kg / cm 2.

In addition, it is preferable that the hybrid deep cord has a lower twist or upper twist twist of 250 to 500 TPM.

In addition, the hybrid deep cord is preferably a fineness of 1000 to 8000 denier.

In addition, it is preferable that the hybrid deep cord has a strong utilization rate of 80% or more.

In addition, the present invention (A) the step of weaving the polyethylene terephthalate yarn and polyethylene naphthalate yarn intertwined with each other and then wound up, (B) giving a twist to the spun yarn to produce a raw cord, (C) the It provides a hybrid deep cord produced by the method comprising the step of immersing the raw cord in the dipping solution.

The present invention provides a hybrid deep code through the following processes.

As a preliminary step for producing a hybrid deep cord in the present invention, the production of polyethylene terephthalate and polyethylene naphthalate multifilament are each prepared using the following process.

 Hereinafter, as a preliminary step for producing a polyethylene terephthalate deep cord applied to the carcass ply of the present invention, the step of manufacturing a high strength polyethylene terephthalate fiber will be described step by step.

The manufacturing process of high strength polyethylene terephthalate fiber comprises the steps of (A) extruding a discharge yarn containing 85 mol% or more of ethylene terephthalate units and having an intrinsic viscosity in the range of 0.90 to 1.2 at a temperature of 290 to 310 ° C, and (B) Passing the molten yarn through a delayed cooling zone and then quenching and solidifying; (C) the POY yarn stretches less than 5% when subjected to an initial stress of 0.5 g / d and has an initial modulus of 20 to 100 g / d. Winding the yarn at a radial velocity such that the birefringence is 0.05 to 0.08, with a force-strain curve extending at least 100% when subjected to 3.5 g / d; and (D) 2.0 times the wound yarn. And multistage stretching at the following total draw ratio.

The high strength polyethylene terephthalate fiber also satisfies the following physical properties and at the same time is less than 3% when subjected to an initial stress of 2.0 g / d, has an initial modulus value of 50 to 150 g / d, of 6.0 g / d It has a force-strain curve that elongates less than 8% when subjected to medium stress and extends until the yarn is cut from a tensile strength of at least 8.0 g / d.

(1) intrinsic viscosity of 0.8 to 1.0, (2) strength of 8.0 g / d or more, (3) elongation of 10% or more, (4) birefringence of 0.20 or more, (5) density of 1.385 to 1.395, (6) 3 to 5% shrinkage

The polyethylene terephthalate polymer used in the manufacturing process of the high strength polyethylene terephthalate fiber contains at least 85 mol% of ethylene terephthalate units, and preferably consists only of ethylene terephthalate units.

Optionally, the polyethylene terephthalate can incorporate small units derived from one or more ester-forming components other than ethylene glycol and terephthalene dicarboxylic acid or derivatives thereof as copolymer units. Examples of other ester forming components copolymerizable with polyethylene terephthalate units include glycols such as 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, and the like, terephthalic acid, isophthalic acid, hexahydroterephthalic acid, stilbene Dicarboxylic acids such as dicarboxylic acid, bibenzoic acid, adipic acid, sebacic acid, azelaic acid.

The polyethylene terephthalate chip according to the present invention preferably melt-mixes terephthalic acid (TPA) and ethylene glycol raw materials at a ratio of 2.0 to 2.3, and the melt mixture is transesterified and condensation-polymerized to give an intrinsic viscosity of 0.60 to 0.70. After making a raw chip, the solid phase is polymerized to have an intrinsic viscosity of 0.90 to 1.20 and a moisture content of 30 ppm or less under a temperature of 240 to 260 ° C and a vacuum.

If the intrinsic viscosity of the chip is lower than 0.90, the intrinsic viscosity of the final drawn yarn is lowered, so that it is impossible to exhibit high strength as a treatment cord after heat treatment. If the intrinsic viscosity of the chip is higher than 1.20, the radial tension is excessively increased and the cross section of the emitter is uneven, thus stretching is in progress. Many filament cuts generate | occur | produce and drawability worsens. In addition, if the moisture content of the chip exceeds 30ppm hydrolysis occurs during the melt spinning.

In the present invention, optionally, during the polycondensation reaction, as a polymerization catalyst, an antimony compound, preferably antimony trioxide, may be added in an amount such that the amount remaining as an antimony metal in the final polymer is from 180 to 300 ppm. If less, the polymerization reaction rate is lowered, and the polymerization efficiency is lowered. If it is more than 300 ppm, more than required antimony metal acts as a foreign material, which degrades radio-stretching workability.

The polyethylene terephthalate chip thus prepared is fiberized according to the method of the present invention, and FIG. 1 schematically shows a manufacturing process according to one embodiment of this invention.

In step (A), the polyethylene terephthalate chip is passed through a pack 1 and a nozzle 2 at a spinning temperature of preferably 290 to 310 ° C., preferably of a spinning draft ratio of 200 to 800 (on the first winding roller). Low-temperature melt spinning at a linear velocity / linear velocity) can prevent a decrease in the viscosity of the polymer due to thermal decomposition and hydrolysis. If the spinning draft ratio is less than 200, the uniformity of the filament cross section is worse, the drawing workability is significantly lowered, and if the spinning draft ratio is higher than 800, filament breakage occurs during spinning, making it difficult to produce a normal yarn.

In step (B), the melt discharged yarn (4) of step (A) is quenched by passing through the cooling zone (3), if necessary, the distance from the nozzle (2) directly below the starting point of the cooling zone (3). That is, it is also possible to install a short heating device in the length (L) section of the hood. This zone is called delayed cooling zone or heating zone, which has a length of 50 to 250 mm and a temperature of 250 to 400 ° C. (air contact surface temperature).

In the cooling zone 3, an open quenching method, a circular closed quenching method, and a radial outflow quenching method may be applied depending on a method of blowing cooling air. It is not limited to. Subsequently, the discharged yarn 4 solidified while passing through the cooling zone 3 can be oiled by the emulsion applying device 5 to 0.5 to 1.0%.

In step (C), the POY yarn stretches less than 5% when subjected to an initial stress of 0.5 g / d, has an initial modulus of 20 to 100 g / d, and further elongates at least 100% when subjected to 3.5 g / d. It has a force-strain curve and winds the yarn at a spinning speed such that the birefringence is 0.05 to 0.08, with a preferred spinning speed being 2000 to 4,000 m / min.

In the present invention, POY's force-strain curve and birefringence are used as factors for controlling the microstructure of the POY yarn.

In particular, in the present invention, the POY yarn stretches less than 5% when subjected to an initial stress of 0.5 g / d, has an initial modulus of 20 to 100 g / d, and further extends at least 100% when subjected to 3.5 g / d. It is characterized by having a deformation curve.

POY having the force deformation curve can be maximized in the stretching process in a subsequent stretching process.

In addition, in the present invention, birefringence of POY is used as a factor for controlling the microstructure of the unstretched phase together with the force-strain curve.

In particular, in the present invention, as described above, excellent stretchability can be obtained in the stretching process only if the POY yarn force strain curve and the birefringence satisfy the above-described range. If the birefringence of POY is less than 0.05, the crystallization rate is too slow in the drawing step, and it cannot sufficiently induce the formation of tie chains between the crystals. If the birefringence exceeds 0.08, the crystallization progresses so rapidly during stretching that it is rather extensible. This is because it is difficult to manufacture high-strength yarn apart from this.

In step (D), the yarn having passed through the first stretching roller 6 is passed through a series of stretching rollers 7, 7, 8, 9 and 10 by a spin draw method while the total draw ratio is 2.0 times or less, preferably The final stretched yarn 11 is obtained by stretching 1.5 to 2.0 times.

In the present invention, the POY yarn is drawn in three steps, and each drawing temperature is higher than the glass transition temperature of the POY company and characterized by being 95 ° C. or less, which is lowered when the drawing temperature is lower than the glass transition temperature. When it exceeds 95 degreeC, crystallization advances rapidly and it is difficult to carry out 3-stage stretching.

While narrowing the distance between the nozzle and the top of the cooling section as possible during spinning, it is advantageous to have high strength in the final stretch yarn, but during spinning, the distance from the nozzle to the bottom of the heating device is less than 50 mm (actually the length directly under the nozzle Since there is a radial block of about 50mm, the distance from the bottom of the heater to the bottom of the heater becomes 100mm when using a heater of 50mm in length.If the distance between the bottom of the heater and the top of the chiller is 50 ~ 150mm, the POY's unevenness This occurs to a considerable degree, and stretching that is not normal physical properties is impossible.

Stretched polyethylene terephthalate fibers produced according to the method of the present invention satisfy the following properties and at the same time less than 3% when subjected to an initial stress of 2.0 g / d, has an initial modulus value of 50 to 150 g / d, It has a force-strain curve that elongates to less than 8% when subjected to medium stress of 6.0 g / d and elongates until the yarn is cut from a tensile strength of at least 8.0 g / d.

(1) intrinsic viscosity of 0.8 to 1.0, (2) strength of 8.0 g / d or more, (3) elongation of 10% or more, (4) birefringence of 0.20 or more, (5) density of 1.385 to 1.395, (6) 3 to 5% shrinkage

As another step for producing a hybrid carcass cord in the present invention, the production of polyethylene naphthalate multifilament is prepared using the following process.

First, the polyethylene-2,6-naphthalate polymer used in the present invention contains at least 85 mol% of ethylene-2,6-naphthalate units, and preferably consists only of ethylene-2,6-naphthalate units. .

Optionally, the polyethylene-2,6-naphthalate may incorporate as a copolymer unit a small amount of units derived from one or more ester-forming components other than ethylene glycol and 2,6-naphthalene dicarboxylic acid or derivatives thereof. Can be. Examples of other ester forming components copolymerizable with polyethylene naphthalate units include glycols such as 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, and the like, terephthalic acid, isophthalic acid, hexahydroterephthalic acid, stilbene Dicarboxylic acids such as dicarboxylic acid, bibenzoic acid, adipic acid, sebacic acid, azelaic acid.

The polyethylene naphthalate chip according to the present invention preferably melt-mixes naphthalene-2,6-dimethylcarboxylate (NDC) and ethylene glycol raw materials at 190 ° C. at a ratio of 2.0 to 2.3 and transesterifies the melted mixture. Reaction (for about 2 to 3 hours at 220 to 230 ° C.) and polycondensation reaction (for about 2 to 3 hours at 280 to 290 ° C.) to form raw chips having an intrinsic viscosity of 0.42 or more, and then 240 to It is solid-phase polymerized to have an intrinsic viscosity of 0.80 to 1.20 and a moisture content of 30 ppm or less under a temperature of 260 ° C and a vacuum.

The present invention may optionally add a manganese compound, preferably manganese acetate, in a transesterification reaction in an amount such that the remaining amount of manganese metal in the final polymer is in the range of 30 to 70 ppm, the amount being 30 If it is less than ppm, the transesterification reaction rate becomes too slow, and if it is more than 70 ppm, more manganese metals than necessary will act as foreign matters, causing problems during solid state polymerization and spinning.

In the present invention, optionally, during the polycondensation reaction, as a polymerization catalyst, an antimony compound, preferably antimony trioxide, may be added in an amount such that the amount remaining as an antimony metal in the final polymer is from 180 to 300 ppm. When less, the polymerization reaction rate is lowered and the polymerization efficiency is lowered. When the amount is higher than 300 ppm, more than necessary antimony metal acts as a foreign material, which degrades radio-stretching workability. In this case, a phosphorus heat stabilizer, preferably trimethyl phosphate, may be added in an amount such that the remaining amount of phosphorus element in the final polymer is 35 to 45 ppm, and the manganese / phosphorus content ratio is 2.0 or less. When the manganese / phosphorus content ratio is higher than 2.0, the oxidation is promoted during the solid phase polymerization, so that normal physical properties cannot be obtained during spinning.

The polyethylene naphthalate chip thus produced is fiberized according to the method of the present invention, and FIG. 1 schematically shows a manufacturing process according to one embodiment of this invention.

In step (A), the polyethylene naphthalate chip is passed through the pack 1 and the nozzle 2 at a spinning temperature of preferably 290 to 328 ° C., preferably of a spinning draft ratio of 20 to 200 (on the first take-up roller). Low-temperature melt spinning at a linear velocity / linear velocity) can prevent a decrease in the viscosity of the polymer due to thermal decomposition and hydrolysis. If the spinning draft ratio is less than 20, the uniformity of the filament cross section worsens, and the drawing workability is significantly lowered. If it exceeds 200, the filament breakage occurs during spinning, making it difficult to produce a normal yarn.

In step (B), the melt discharged yarn (4) of step (A) is quenched by passing through the cooling zone (3), if necessary, the distance from the nozzle (2) directly below the starting point of the cooling zone (3). That is, it is also possible to install a short heating device in the length (L) section of the hood.

This zone is called delayed cooling zone or heating zone, which has a length of 50 to 250 mm and a temperature of 250 to 400 ° C. (air contact surface temperature).

In the cooling zone 3, an open quenching method, a circular closed quenching method, and a radial outflow quenching method may be applied depending on a method of blowing cooling air. It is not limited to. Subsequently, the discharged yarn 4 solidified while passing through the cooling zone 3 can be oiled by the emulsion applying device 5 to 0.5 to 1.0%.

In step (C), the unstretched yarn elongates less than 10% when subjected to an initial stress of 0.3 g / d, has an initial modulus of 10 to 50 g / d, and is greater than the initial stress and less than 1.0 g / d. The yarn is then wound at a spinning speed such that the birefringence is between 0.001 and 0.015, with a force-strain curve extending at least 200%, with a preferred spinning speed being 200 to 1,000 m / min.

In the present invention, the force-strain curve and birefringence of the undrawn yarn are used as factors for controlling the microstructure of the undrawn yarn.

In particular, in the present invention, when the unstretched yarn is subjected to an initial stress of 0.3 g / d, it is less than 10% elongated, has an initial modulus of 10 to 50 g / d, and is larger than the initial stress and is less than 1.0 g / d. Further characterized by having a force-strain curve, elongating at least 200%.

Unstretched yarn having the force deformation curve can be maximized in the stretching process in the subsequent stretching process.

In addition, in the present invention, the birefringence of the undrawn yarn is used as a factor for controlling the microstructure of the undrawn phase together with the force-strain curve.

In particular, in the present invention, as described above, only the unstretched force strain curve and the birefringence satisfy the above-described ranges to obtain excellent stretchability in the stretching process. The reason is that if the birefringence of the undrawn yarn is less than 0.001, the crystallization rate is too slow in the drawing step to sufficiently induce the formation of tie chains between the crystals. If the birefringence exceeds 0.015, the crystallization progresses too rapidly during drawing. Rather, it is difficult to manufacture high strength yarns due to the poor stretchability.

In step (D), the yarn having passed through the first stretching roller 6 is passed through a series of stretching rollers 7, 7, 8, 9 and 10 by spin draw, while the total draw ratio is at least 4.0 times, preferably The final stretched yarn 11 is obtained by stretching to 4.5 to 6.5.

While narrowing the distance between the nozzle and the top of the cooling section as possible during spinning, it is advantageous to have high strength in the final stretch yarn, but during spinning, the distance from the nozzle to the bottom of the heating device is less than 50 mm (actually the length directly under the nozzle Since there is a radial block of about 50mm, the distance from the bottom of the heater to the bottom of the heater is 100mm when using a heater of 50mm in length. Or, if the distance between the bottom of the heater and the top of the cooling device is 50 to 150mm, it is not drawn. The nonuniformity of is generated to a considerable extent, so that it is impossible to draw normal physical properties.

Polyethylene naphthalate fibers prepared according to the method of the present invention have an intrinsic viscosity of 0.60 to 0.90, strength of 8.5 g / d or more, elongation of 6.0% or more, birefringence of 0.35 or more, density of 1.355 to 1.375, melting point of 270 to 285 ° C, and It has a shrinkage of 1 to 4% and a fineness of 500 to 2000 denier.

The core technical configuration of the present invention is to produce a raw cord by twisting and winding the polyethylene terephthalate yarn and polyethylenenaphthalate yarn produced according to the above method and then twisting the yarn. The mutual entanglement of the yarns is made on the interlace nozzle, where the air pressure of the interlace is preferably 0.5 to 4.0 kg / cm 2. When the air pressure is 0.5 kg / cm 2 or less, sufficient entanglement does not enter due to the high elastic modulus of polyethylene terephthalate yarn and polyethylene naphthalate yarn, and at 4 kg / cm 2 or more, excessive tension and twist are applied to the yarn, thereby causing a strong degradation during the twisting. The present invention provides a hybrid deep cord having excellent strength when used as an industrial material such as a tire cord by preventing the fiber damage in the twisting step by imparting regular entanglement by passing through the interlace nozzle before plying.

In general, interlacing technology has been used as a method for making a thread formed by confusion, entanglement, loops, or wool by passing air through a composite yarn or a filament yarn. The interlacing technique causes the filaments to be entangled or interlaced and twisted by striking the air in an oblique direction to the traveling direction of the filament. It is used as the main means of horn sum. It is used as the main means of horn sum. It is also used for horn sum when spinning and intertwine with twisted yarn and untwisted yarn. It can also be used with flammable equipment during false twisting. In addition, it improves the focusing of the yarn, thereby improving the flatness, thereby contributing to the improvement of speaker workability. Recently, interlacing technology has been developed as a new material having different physical properties by compounding and combusting natural staple yarns such as synthetic fiber, wool, cotton, and viscose acrylic yarn, and is also included in a composite yarn manufacturing machine that produces these materials. In addition, the interlace technology has a great advantage that the purpose is to improve the weaving and the manufacturing cost is lower than the combustible or sizing of the filament.

As a preliminary step of manufacturing the hybrid dip cord of the present invention, twisted yarns are twisted (weaving process) to produce raw cords.

When explaining the twisting process of the present invention in more detail, by twisting the two twisted yarns produced by the above method with a direct twisting machine in which the twisting and joining is carried out simultaneously to produce a 'raw cord (Raw Cord)' for the tire cord. . The raw cord is manufactured by combining Ply Twist with two twisted yarns followed by Cable Twist, and in general, the upper and lower leads are applied with the same or different years as necessary.

An important result of the present invention is that the physical properties of the cord elongation, mesophilic, fatigue resistance, etc. are changed depending on the level of twisting (years) applied to the spliced yarn. In general, when the twist is high, the strength decreases, and the trunk and the body tend to increase. In addition, fatigue fatigue tends to improve with increasing twist. The number of years of hybrid tire cords produced in the present invention was made of 250/250 TPM to 500/500 TPM at the same time as the upper and lower edges, but giving the same upper and lower edges to the same value indicates that the manufactured tire cords do not show rotation or twist. It is to maximize physical expression by making it easy to maintain a straight line without. At this time, if less than 250/250 TPM, the extension of the raw cord is reduced, fatigue fatigue is easy to fall, and if it exceeds 500/500 TPM, the strong degradation is large, it is not suitable for the tire cord.

In the present invention, if the number of years of upper and lower smoke is given differently, in this case, the upper lead is adjusted to 350TPM to 550TPM, and the lower lead is adjusted to 300TPM to 550TPM, respectively, the upper and lower lead is produced with different soft cords. . The reason why the upper and lower stations are differently produced is that the lower the number of stations within the optimum properties of the raw cord, the lower the cost of the yarn and the more the economic benefits.

Raw cord is manufactured using a weaving machine, and the obtained fabric is immersed in a dipping solution, and then cured to produce a tire cord having a resin layer attached to the surface of the raw cord. Make a 'Dip Cord'.

In more detail, the dipping process of the present invention, dipping is achieved by impregnating a surface of the fiber with a resin layer called RFL (Resorcinol-Formaline-Latex), which is a disadvantage of the fibers for tire cords that are inherently poor in adhesion to rubber. Is carried out to improve.

In more detail, the dipping process of the present invention, dipping is achieved by impregnating a surface of the fiber with a resin layer called RFL (Resorcinol-Formaline-Latex), which is a disadvantage of the fibers for tire cords that are inherently poor in adhesion to rubber. Is carried out to improve. In general, rayon fiber or nylon is subjected to one bath dipping, and when polyethylene terephthalate or polyethylene naphthalate fiber is used, since the reactor of the fiber surface is less than that of rayon fiber or nylon fiber, the PET surface is activated first. Adhesion treatment is performed (two bath dipping). Hybrid cord yarn according to the present invention uses two bath dipping.

In the present invention, as an example of the dipping liquid (adhesive liquid) for the adhesion of the hybrid cord and rubber can be prepared and used using the following method. The examples described below are only intended to more clearly understand the present invention and are not intended to limit the scope of the present invention.

29.4 wt% Resorcinol 45.6

Pure 255.5

37% formalin 20

10wt% sodium hydroxide 3.8

After preparing the reaction, the reaction was stirred at 25 ° C for 5 hours, and then the following components were added.

40wt% VP-Latex 300

Pure 129

28% ammonia water 23.8

After the ingredient is added, the mixture is aged at 25 degrees for 20 hours to maintain a solid concentration of 19.05%.

After the drying, the adhesive liquid is imparted. In order to adjust the adhesion amount of the adhesive liquid, it is preferable to add a stretch of 0-3%, and more preferably, a stretch of 1-2% is required. If the stretch is too high, the adhesion amount of the adhesive solution can be controlled, but the result is a decrease in the elongation, resulting in a decrease in fatigue resistance.If the stretch is too low, for example, if it is lowered to less than 0%, the inside of the cord As the dip solution penetrates, it becomes impossible to control the DPU.

The adhesive amount is preferably 4% -6% by weight of the fiber based on the solid content. After passing through the adhesive liquid is dried at 120-150 ℃. At this time, dry for 180 seconds-220 seconds, and it is important to dry the cord with 1% -2% stretch on the cord.

After drying, heat treatment is performed in a temperature range of 130 to 170 ° C. The stretch during the heat treatment is maintained between -2-0%, the heat treatment time is appropriate 50 seconds-90 seconds. If the heat treatment is less than 50 seconds, the reaction time of the adhesive liquid is insufficient, resulting in low adhesive strength. If the heat treatment is longer than 90 seconds, the hardness of the adhesive liquid is increased, resulting in a decrease in fatigue resistance of the cord. Will be imported.

The hybrid dip cord prepared according to the above-mentioned method is (1) 15 kg or more of strength, (2) elongation of 6% or more, (3) 10 kg or more of adhesion to rubber, (4) 80% or more of fatigue resistance, and (5) 2000 to 2000 Fineness of 8000 deniers, (6) 3.5% shrinkage, (7) The sum of the median elongation (%) and dry heat shrinkage (%) is 6.5% or less, which can be advantageously used as a tire cord for passenger cars.

Figure 2 is an example schematically showing the structure of a tire for a passenger car manufactured using a hybrid deep cord according to the present invention as a carcass ply or cap fly.

The bead regions 35 of the tire 31 each have an annular bead core 36 that is inextensible. The bead core is preferably made of a single or single filament steel wire wound continuously. The bead region also has a bead filler 37, and in the case of the bead filler, it is necessary to have a hardness of at least a certain level.

The tire 31 is reinforced by the crown portion by the belt 38 and the cap fly 39 structure. The belt structure 38 comprises two cutting belt plies 40 and the cords 41 of the belt plies are oriented at an angle of about 20 degrees with respect to the circumferential central surface of the tire. The cord ply 41 of the belt ply is arranged opposite to the direction of the cord 22 of the other belt ply in a direction opposite the circumferential central plane. However, the belt 38 may comprise any number of plies and may preferably be arranged in the range of 16-24 °. The belt 38 serves to provide lateral stiffness to minimize the rise of the tread 43 from the road surface during operation of the tire 31. The cords 41 and 42 of the belt 38 are made of steel cords and have a 2 + 2 structure, but can be manufactured in any structure. The cap ply 41 and the edge ply 44 are reinforced on the upper portion of the belt 38. The cap ply cord 45 in the cap ply 39 is reinforced in parallel to the circumferential direction of the tire, thereby increasing the speed of the tire. It serves to suppress the change in the size of the circumferential direction, and a cap fly cord 45 having a large heat shrinkage stress at a high temperature is used. One layer of cap ply 39 and one layer of edge ply 41 may be used, but preferably 1-2 layers of cap ply and also 1-2 layers of ply reinforcement. The carcass cord or capfly cord may use a hybrid deep cord manufactured according to the method of the present invention.

Hereinafter, the structure and effect of the present invention will be described in more detail with specific examples and comparative examples, but these examples are only intended to more clearly understand the present invention, and are not intended to limit the scope of the present invention. In Examples and Comparative Examples, properties of the tire cord and the like were evaluated in the following manner.

(a) the number of intersections

After running the filament yarn through the entanglement measuring device, the number of entanglements per unit length in the lateral direction was measured by inserting a sharp pin in the middle of the traveling yarn, where the unit is expressed as the number of entanglements per meter.

(b) Hybrid tire cord strength (kgf) and medium elongation (%)

Using Instron 5565 (manufactured by Instron, USA), 250 mm sample length, 300 mm / min tensile speed and 20 turns / s under standard conditions (20 ° C., 65% relative humidity) according to ASTM D 885 Elongation was measured under conditions of m. On the S-S curve, the yarn was elongated at 4.5 g / d and the treated cord was elongated at 2.25 g / d.

(c) strong utilization rate

Two strands of filament yarn (A, B) for the strength of the filament yarn measured at 250 mm and the tensile speed of 300 m / min using an Instron low speed tensile tester under standard conditions (20 ° C, 65% relative humidity). ) Shows the percentage of deep cord strength obtained by impregnation after burning.

Strength utilization (%) = Deep code strength / (A yarn strength + B yarn strength) × 100

Example 1

In order to prepare the fiber for tire reinforcement, polyethylene terephthalate and polyethylene naphthalate fibers were obtained as described above. The obtained polyethylene terephthalate yarn (1000d / 200f) and polyethylene naphthalate yarn (1000d / 200f) are entangled with each other and then twisted together and then wound up. At this time, the mutual entanglement is made on the interlace nozzle, and the air pressure of the interlace is 2.0 kg / cm 2. The twisted yarn of 2000 denier yarn was twisted in two, and the yarn tension was maintained at 200 g per head. The number of years was 340TPM, and the same condition was performed.

The resulting hybrid raw cord was dried at 100 degrees for 130 seconds, and then passed through an adhesive liquid prepared by the following method to give an adhesive liquid. During drying, 2% of stretch was added to prevent non-uniformity of raw cords due to heat shrinkage.

29,4 wt% resorcinol 45.6

Pure 255.5

37% formalin 20

10wt% sodium hydroxide 3.8

After preparing the reaction, the reaction was stirred at 25 ° C for 5 hours, and then the following components were added.

40wt% VP-Latex 300

Pure 129

28% ammonia water 23.8

After the ingredient is added, the mixture is aged at 25 degrees for 20 hours to maintain a solid concentration of 19.05%.

After giving an adhesive liquid, it dried for 2 minutes at 150 degreeC, and heat-processed for 1 minute at 170 degreeC, and the adhesive process was complete | finished. Table 1 shows the physical properties of the dip cord thus prepared.

Example 2

Except that the polyethylene terephthalate yarn (750d / 150f) and polyethylene naphthalate yarn (750d / 150f) intertwined and manufactured by 1500 denier, and then twisted with 1500 denier / double sum (the number of years is 390 TPM) Experiments were carried out in the same manner as in Example 1 to prepare raw and processed codes.

Example 3

Polyethylene terephthalate yarn (1500d / 250f) and polyethylene naphthalate yarn (1500d / 250f) interwoven together to make 3000 denier, and then twisted with only one 3000 denier (years 390 TPM) to manufacture a single cord. Except that the experiment was carried out in the same manner as in Example 1 to prepare a raw code and a treatment code.

Comparative Example 1

In order to prepare the fiber for tire reinforcement, polyethylene terephthalate and polyethylene naphthalate fibers were obtained as described above. Raw code and treatment were carried out in the same manner as in Example 1 except that the obtained polyethylene terephthalate yarn (2000d / 400f) and polyethylene naphthalate yarn (2000d / 400f) were each twisted with 2000 denier / 2p. Cord was prepared. Table 1 shows the physical properties of the dip cord thus prepared.

Comparative Example 2

In order to prepare the fiber for tire reinforcement, polyethylene terephthalate and polyethylene naphthalate fibers were obtained as described above. Raw code and treatment were carried out in the same manner as in Example 1 except that the obtained polyethylene terephthalate yarn (1500d / 250f) and polyethylenenaphthalate yarn (1500d / 250f) were each twisted by 1500 denier / 2p. Cord was prepared. Table 1 shows the physical properties of the dip cord thus prepared.

TABLE 1

    Classification Condition Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Yarn Type 2000D Hybrid manufactured by combining PET1000D and PEN1000D 1500D hybrid manufactured by combining PET750D and PEN750D 3000D hybrid manufactured by combining PET1500D and PEN1500D PET2000D and PEN2000D PET1500D and PEN1500D Yarn Properties PET2000D PEN2000D PET1500D PEN1500D Strong (kgf) 17.8 13.5 26.7 16.0 18.8 12.2 14.3 Strength (g / d) 8.9 9.0 8.9 8.0 9.4 8.1 9.5 Intermediate Elongation (%) 3.7 3.6 3.8 5.6 3.0 5.5 3.0 Elongation at break (%) 10.8 10.6 11.1 14.2 9.8 14.3 9.8 Deep Code Property Speaker in two go of hybrid company Speaker in two go of hybrid company Speakers with one hybrid company Speakers are made of PET and PEN in 2 go PET, PEN yarn combined in two Strong (kgf) 30.3 23.4 24.2 26.8 20.7 Intermediate Elongation (%) 3.2 3.1 3.2 3.4 3.5 Strong utilization rate compared to yarn (%) 85.0 86.5 91.0 77.0 78.0

* PET: polyethylene terephthalate, PEN: polyethylene naphthalate

In view of the test results of Table 1, the strong utilization rate of the deep cord is entangled with the polyethylene terephthalate yarn and polyethylene naphthalate yarn and weaved together in the case of the present invention to give a twist to the spun yarn produced by the raw cord ( It can be seen that Example 1-3) is superior to Comparative Example 1 or 2.

The hybrid deep cord made of polyethylene terephthalate and polyethylene naphthalate of the present invention is excellent in shape stability and strength to overcome the disadvantage that the conventional polyethylene naphthalate fiber lacks the shape stability at high temperature, the polyethylene naphthalate fiber It can supplement the high price and can be usefully used as reinforcement of rubber products such as tires and belts or for other industrial uses.

According to the present invention, satisfactory results such as tire durability, ride comfort, and steering stability are obtained by applying a hybrid deep cord made of the polyethylene terephthalate and polyethylene naphthalate multifilament of the present invention to the carcass layer of a pneumatic radial tire for a passenger car. Can be obtained.

While the invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims. .

1 is an example schematically showing a polyethylene terephthalate and polyethylene naphthalate spinning process according to the present invention.

Claims (8)

(A) step of winding the polyethylene terephthalate yarn and polyethylene naphthalate yarn and entangled with each other and then wound up, B) preparing a twisted yarn by twisting the twisted yarn, and adding the twisted yarn to two or three yarns, and adding the upper twisted yarn to produce a raw cord; C) A hybrid deep cord produced by the method comprising the step of immersing the raw cord in a dipping solution. The method of claim 1, A hybrid deep cord, wherein polyethylene terephthalate and polyethylene naphthalate are spun together in a ratio of 0.5 to 2: 1. The method of claim 1, The mutual interlock is made on the interlace nozzle, wherein the air pressure of the interlace is a hybrid deep cord, characterized in that 0.5 ~ 4.0kg / ㎠. The method of claim 1, The hybrid deep cord is a hybrid deep cord, characterized in that the lower or upper twist twist 250 ~ 500TPM. The method of claim 1, The hybrid deep cord is a hybrid deep cord, characterized in that the fineness of 1000 to 8000 denier. The method of claim 1, The hybrid deep code is a hybrid deep code, characterized in that the strong utilization of more than 80%. (A) step of winding the polyethylene terephthalate yarn and polyethylene naphthalate yarn and entangled with each other and then wound up, B) applying a twist to the plied yarn to produce a raw cord, C) A hybrid deep cord produced by the method comprising the step of immersing the raw cord in a dipping solution. A radial pneumatic tire comprising the hybrid deep cord of claim 1 or 7 in a carcass layer or a belt reinforcement layer.