KR20100113820A - Method for producing of nylon 66 tire cords - Google Patents

Abstract

PURPOSE: A method for manufacturing the nylon 66 tire cord is provided to expose the pink cord according to the abrasion of thread part of the aircraft tire and recognize an abrasion degree of the tire easily, thereby determining the exchange period of the tire stably. CONSTITUTION: A dyeing liquid is manufactured. The dyeing liquid includes a reactive AZO dyes of 0.5 to 3.5 weight % about pure 100 weight %. The tension is applied to the nylone 66 thread cord. The nylon 66 thread cord passes through the dyeing liquid. The nylon 6 fiber performs a drying and thermal treatment. The processed nylon 66 fiber passes through the RFL(Resorcinol-Formaline Latex) of the secondary processing liquid. The drying and stabilizing of fiber is performed.

Description

Method for producing nylon 66 tire cords {Method for Producing of Nylon 66 Tire Cords}

The present invention relates to a method of manufacturing a fiber for an aircraft tire cord by treating a dye to nylon 66 fibers, and manufacturing a safe aircraft tire cord that can easily recognize the wear of the tire by visually determining the state of the tire cord. can do.

In general, the tire is made entirely black by using carbon black to improve the mechanical properties of the rubber, even if the tire is worn to a considerable extent, it is very difficult to visually determine the degree of wear. In particular, aircraft tires are used at a high pressure of about 300 psi or more, a high load of 16,000 lbs or more, and a high speed of about 400 km / h, thereby increasing wear. Therefore, it is very important to check the wear level of the tire accurately for safe takeoff and landing of the aircraft, and it is necessary to replace the tires in a timely manner.

In order to improve this problem, in the present invention, the tire is worn out by dyeing the reinforcing cord used in the outermost layer of the tread portion of the tire with a specific dye so that the wear level of the tire can be visually identified. When a certain color appeared, it was possible to judge when it was time to replace the tire. As mentioned above, a cord dyed in an airplane tire is referred to as an indicator code, which should be excellent in fluorescence clarity so that the wear of the tire can be measured clearly even in the dark. In the present invention, it was dyed pink, because pink is excellent in sharpness and long visibility. In other words, when the tire wears out, the pink code of the tread part is expressed out so that the wear degree of the tire can be easily recognized. However, since the physical properties of the tire cord may be affected by the dyeing condition of the tire cord, the dyeing conditions and the process conditions should be appropriately set.

Republic of Korea Patent No. 10-0221603 is a salt solution composed of 0.2 to 1.0% by weight of the acid dye of the total weight of the salt solution, and 0.0001 to 0.001% by weight of the acid dye relative to the total weight of the salt solution, temperature of the salt solution temperature of 1.5 ~ 3.0 ℃ / min, 95 A dyeing treatment temperature of ˜110 ° C. and a pH of 4.4 to 5.5 are used to dye nylon 66 fibers and to manufacture a tire cord for an aircraft using dyed nylon 66 fibers. However, this method can produce uniformly dyed nylon 66 fibers, but requires additional equipment for dyeing, and also requires additional equipment investment, and also slows 1.5 ~ 3.0 ℃ / min at 95 ~ 110 ℃. It is processed at a rate of temperature increase, and because of the need to maintain a uniform pH, productivity is also limited.

The present invention has been made to solve the above problems, and simultaneously treated the dye during the process (dipping process) of the resorcinol formalin latex (RFL) of nylon 66 tire cord, dyeing conditions and processes By properly adjusting the conditions, it is possible to provide a uniformly dyed nylon 66 tire cord for aircraft tires.

The present invention for achieving the above object, the method comprising the steps of preparing a dyeing solution containing 0.5 to 3.5% by weight relative to 100% by weight of the reactive azo dye; Passing the nylon 66 twisted cord through the dyeing solution while applying a tensile force; Drying and heat-treating the fibers having passed through the dyeing solution; Passing the heat treated nylon 66 fibers through a resorcinol formalin latex (RFL) solution, which is a secondary treatment solution; It provides a method for producing a nylon 66 tire cord comprising the step of drying and stabilizing the fibers passed through the secondary treatment liquid.

In addition, 0.5% to 3.5% by weight of the dye may be further added to the secondary liquid treatment liquid (RFL).

In addition, the tension is preferably 0.03 to 0.25 g / d when passing through the dyeing solution.

Furthermore, it is preferable to dry the nylon 66 fiber which passed the dyeing liquid at the temperature of 130-160 degreeC, and to heat-process at the temperature of 200-250 degreeC.

The present invention also provides a nylon 66 fiber which is treated by the above method and has an initial adhesive strength of 12.0 kgf or more and is excellent in clarity and can be used as an airplane tire.

As such, the nylon 66 fibers according to the present invention are uniformly dyed into a pink color with a long visible distance by treating the dye solution during heat treatment without using a separate dyeing apparatus, and wear of the tire when used in the tread portion of the aircraft tire. By visually checking the status, it is possible to determine the replacement time stably.

Hereinafter, the present invention will be described in more detail.

The present invention relates to a tire cord for an aircraft used in high pressure, high load conditions, the tire cord used in the present invention is a nylon 66 fiber with high strength, excellent shape stability and fatigue resistance, and excellent adhesion to rubber. In the present invention, in order to make the tire tread part wear out of the aircraft, the pink code is expressed out so that the wear degree of the tire can be easily recognized, and the secondary treatment liquid mainly composed of a dye solution prepared using a reactive dye and RFL adhesive is used. Use Here, the dyeing solution imparts a vivid color to the nylon 66 fibers, and the RFL solution serves to bond the dyed nylon 66 fibers with the rubber.

Referring to the staining solution of the present invention.

The content of the reactive azo dye in the dyeing solution of the present invention is such that 0.5 to 3.5% by weight, more preferably 1.0 to 3.0% by weight, relative to 100% by weight of pure water. When the content of the dye is 0.5% by weight or less, the lack of dye does not produce a vivid color, and in the case of 3.5% by weight or more, it is difficult to uniformly disperse the dye during the dyeing solution production, and the roller may be dried or heat treated. Because of the dye, the cleaning cycle is shortened and productivity is lowered, which adversely affects the adhesion of the nylon tire cord.

After the dyeing solution is prepared, the nylon 66 fibers are tensioned and passed through a general immersion method. The tension of the fiber is suitably 0.03 to 0.25 g / d, more preferably 0.05 to 0.20 g / d. If less than 0.03g / d may decrease the physical properties of the fiber, if it exceeds 0.25g / d is due to the excessive tension of the dye is lowered due to the excessive tension is lacking the vivid color and affects the properties of the fiber. Nylon 66 fibers which have passed through the dye solution are dried in the drying zone. At this time, the drying temperature is preferably 130 to 160 ° C, and is treated for 20 to 150 seconds. If the drying temperature and time is low, the drying is not sufficient, and if the drying temperature is higher than 160 ℃ or dried for more than 150 seconds, the physical properties of the fiber is lowered by heat. The dried fibers are heat treated at 200 to 250 ° C. for 20 to 150 seconds. When the heat treatment temperature is less than 200 ℃ dimensional stability of the cord is lowered due to the lack of thermal history, if it exceeds 250 ℃ may cause pyrolysis of nylon 66 fibers.

After the heat treatment, the nylon 66 fiber is passed through the secondary treatment solution consisting of RFL alone or RFL added with 0.5 to 3.5% by weight of dye, and the nylon 66 fiber passed through the secondary treatment solution undergoes a drying process again. After roughening, heat treatment is performed in the stabilization zone to stabilize the adhesive force on the nylon 66 fiber surface. When the content of the dye added to the RFL is 0.5% by weight or less, the lack of dye does not produce a vivid color, and in the case of 3.5% by weight or more, it is difficult to uniformly disperse the dye during dyeing solution preparation.

The nylon 66 fibers thus manufactured are uniformly dyed pink with a long visible distance by treating the dyeing solution during heat treatment without using a separate dyeing apparatus, and visually inspecting the wear state of the tires when used in the tread portion of an aircraft tire. It shows the feature that can confirm the replacement time stably by checking with.

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 the comparative examples and examples, the following evaluation methods were utilized.

(a) Tensile strength (kgf), Elongation at break (%) and Intermediate elongation (%) of multifilament

Instron's low speed tensile tester (Instron 4465) was used and the sample length was measured at 250 mm and tensile speed of 300 m / min. Elongation at specific load indicates elongation at 4.5 kgf. The lower the elongation, the higher the elastic modulus and the less the deformation of the filament.

(b) adhesion (kg)

As a method of showing the adhesion between the treated cord and the rubber, the cord was placed in a rubber block and vulcanized at 50 kgf / cm ² for 30 minutes at 150 ° C., followed by a tensile rate of 200 m / using an instron slow extension tester. Measure the adhesion with min. The same test was carried out 10 times to obtain an average value. Other methods were performed according to ASTM D4776-98.

(c) dyeability (sharpness)

As a measure for evaluating the degree of staining in the cord, the cord after the dyeing and RFL treatment is cut using a cross-sectional view, and then photographed 100 times using an optical microscope. Ten observers visually judged the photograph thus taken, and if more than eight out of ten were judged to be excellent, it was evaluated that the sharpness was excellent (○). In addition, when 5 to 8 people rated it as excellent, the average (△) and 5 or less people judged it as being excellent (x). This judgment used the average value after evaluating five photographs of the same sample.

TABLE 1

TABLE 2

※ Dyeing degree: excellent (○), normal (△), lack (×)

[Comparative Examples 1 to 3]

A dyeing solution was prepared by adding 4.0% by weight of the reactive azo dye for dyeing nylon 66 fibers, compared to 100% by weight of pure water. The nylon 66 fiber twisted cord was immersed in the dyeing solution while passing through a tension of 0.15 g / d, dried at 140 ° C. for 2 minutes in a drying area, and heat-treated at 230 ° C. The nylon 66 fibers, which were subjected to the above treatment process, were impregnated with RFL adhesive solution, which is a secondary treatment solution, dried at 140 ° C., and stabilized at 230 ° C., thereby preparing nylon 66 fibers for tire cords. The conditions and evaluation results at this time are shown in Tables 1 and 2.

Claims (5)

Preparing a dyeing solution comprising 0.5 to 3.5% by weight of the reactive azo dye based on 100% by weight of pure water; Passing the nylon 66 twisted cord through the dyeing solution while applying a tensile force; Drying and heat-treating the fibers having passed through the dyeing solution; Passing the heat treated nylon 66 fibers through a resorcinol formalin latex (RFL) solution, which is a secondary treatment solution; The method of manufacturing a nylon 66 tire cord, characterized in that consisting of drying and stabilizing the fibers passed through the secondary treatment liquid. The method of claim 1, The method of manufacturing a nylon 66 tire cord, characterized in that the addition of 0.5 to 3.5% by weight of dye to the secondary liquid treatment solution (RFL). The method of claim 1, The method of producing a nylon 66 tire cord, characterized in that the tension is 0.03 to 0.25 g / d when passing through the dye solution. The method of claim 1, A method for producing a nylon 66 tire cord, wherein the nylon 66 fibers having passed through the dye solution are dried at a temperature of 130 to 160 ° C. and heat treated at a temperature of 200 to 250 ° C. The method according to claim 1, wherein A method for producing a nylon 66 tire cord, characterized in that the initial adhesion with rubber is 12 kgf or more.