KR20160074344A - Nylon 66 prepreg capply and process for preparing the same - Google Patents

Abstract

The present invention provides a method for manufacturing a capply for a radial tire, and more specifically, to a method for manufacturing a nylon 66 prepreg capply, performing an impregnation process to nylon 66 flat fiber with matrix resin. The capply for a radial tire is manufactured by impregnating the nylon 66 fiber in matrix resin, wherein the nylon 66 fiber does not undergo a twisting process, has the thickness of 0.001mm to 100mm and is aligned with the width of 5mm to 100mm. The capply prepreg having high contraction stress and adhesion can be manufactured with lower costs. A tire manufactured using the capply prepreg has high stability in the shape thereof and maintains superior performance of handling at high temperatures. According to the present invention, the light weight of the tire and improvement of fuel efficiency of a vehicle can be expected. The capply for a radial tire, which can maintain stability of the shape of the tire during driving, can be provided.

Description

[0001] Nylon 66 prepreg cap ply and process for preparing same [0001]

The present invention relates to a method for producing a nylon 66 prepreg cap ply, which is characterized in that a matrix resin is impregnated with nylon 66 flat fibers. The tire to which the cap ply manufactured by the above-mentioned manufacturing method is applied has high shape stability and high temperature A tire with high handling performance can be manufactured.

The provision of a cap ply on a tire for a passenger car is for the safety of the tire, and a tire having such a cap ply has become popular in recent years. The cap ply refers to a part between the tire tread portion and the steel cord layer for reinforcing the belt, which is continuously wound without breaking in the circumferential direction of the tire, thereby maintaining the shape stability of the tire. Such cap ply is generally reinforced with a material having heat shrinkage force particularly at high temperature.

When the vehicle travels, a load is applied in the axial direction of the tire cord, and the tire cord is repeatedly deformed and recovered in the axial direction by the load. In this deformation-recovery, the tensile-load curve at the time of deformation and recovery occurs along the curve, and the loss of the tire cord itself due to the difference in the recovery curve caused by the deformation due to the tensile load and the load is removed do. This work loss contributes to the temperature rise of the tire and the tire cord, and due to this work loss, the tire rotates while having energy loss, resulting in energy loss during traveling. This energy loss leads to the rotational resistance of the vehicle, which generally leads to an increase in the fuel economy of the vehicle due to the increase in the rotational resistance of the tire and a rise in the temperature of the tire due to driving when a material having a characteristic of high energy loss is used .

The role of the cap ply material is to prevent the size of the tire from increasing during travel as the cap ply shrinks when the temperature of the tire rises due to vehicle travel. In this case, since the size of the tire is not increased, an increase in the rotational inertia of the tire is prevented, resulting in reduction of energy consumption and suppression of heat generation of the tire, thereby increasing fatigue life and increasing durability.

In general, the most widely used material for cap ply materials is nylon 66, which is due to the high shrinkage of nylon 66. The reinforced part of the cap ply is known to be the highest temperature during running of the tire. Therefore, a heat-resistant material should be used in addition to heat shrinkage, and a material having a low adhesive strength due to heat should be used. Nylon 66 is the material used for tire cords. However, these materials are difficult to apply to cap ply because they are weak to heat, and especially because of the decrease in adhesion due to heat.

Other materials that can be used as cap fly material include aramid. Aramid has different characteristics from nylon 66. An aramid fiber is an aromatic polyamide fiber, a polyamide fiber having a benzene ring in a repeating unit. When applied to tire cap ply, it is difficult to expect shrinkage force at high temperature. However, since the deterioration of physical properties is extremely small even at high temperature, deformation is suppressed and it shows characteristics similar to the result of applying nylon cap ply. Accordingly, although the use of such aramid fibers is increasing, the aramid fiber has a problem of low fatigue resistance, and at the same time, it is costly because of its high price.

The object of the present invention is to solve the problems of the material of the cap fly of the conventional radial tire.

Korean Patent No. 1374924 Korean Patent Publication No. 2007-0098004 International Patent Publication No. 2001-76892 International Publication No. 2012-005751

It is an object of the present invention to provide a cap ply comprised of a nylon 66 prepreg for application to a cap ply of an air inlet radial tire for a passenger car and a method of manufacturing the same.

The present invention provides a method for producing a nylon 66 prepreg cap ply, which comprises impregnating a matrix resin with nylon 66 flat fibers not subjected to a twisting process, in a method of manufacturing a cap ply for radial tires.

Specifically, the nylon 66 flat fiber has a thickness of 0.001 to 2 mm and a width of 5 to 100 mm.

In addition, a nylon 66 prepreg cap ply made by the above-described method is provided.

The present invention relates to a cap ply for radial tires, which is a nylon 66 fiber not subjected to a twisting process, which is produced by impregnating a matrix resin with fibers arranged in a width of 0.001 mm to 100 mm and a width of 5 mm to 100 mm, The cap ply prepreg can be produced at low cost. Also, the tire made of the prepreg is advantageous in that it has high shape stability and high handling performance at high temperature.

In addition, according to the present invention, it is possible to provide a radial tire cap ply which can be expected to reduce the weight of the tire and improve the fuel consumption of the automobile, and to maintain the shape stability of the tire during driving.

Fig. 1 is a schematic view of a structure of a tire for a passenger car, which is produced by using a nylon 66 prepreg according to the present invention in a cap ply.

In order to achieve the above object, the present invention relates to a cap ply for a radial tire in which a conventional nylon 66 fiber is replaced by a nylon 66 prepreg, and a method for producing the cap ply. The nylon 66 flat fiber has a thickness of 0.001 mm to 2 mm, Which is composed of nylon fibers arranged in a width of 5 mm to 100 mm and impregnated with a matrix resin.

In addition, according to the present invention, it is possible to provide a radial tire cap ply which can be expected to reduce the weight of the tire and improve the fuel consumption of the automobile, and to maintain the shape stability of the tire during driving.

The present invention also provides a tire including the cap ply.

Specifically, the nylon 66 reinforcing material to be used in the production of the tire is prepared by preparing a solid-state polymerized chip such that 90 wt% or more of nylon 66 polymer has a relative sulfuric acid relative viscosity of 3.0 to 3.5 (sulfuric acid: 96% solution) Nylon flat fibers are obtained. The nylon flat fibers are aligned with a thickness of 0.001 mm to 2 mm and a width of 5 mm to 100 mm and then impregnated with a matrix resin to prepare a nylon prepreg.

The nylon 66 fibers used in the present invention are characterized in that they are not subjected to a twisting process. In other words, in the past, a complicated manufacturing process of imparting twist to the nylon 66 fiber has been required. Therefore, the manufacturing cost is increased, and rubber is added in order to ensure that the textile cord is adhered well to the tire rubber. There is a problem of increasing the weight.

However, in the present invention, the following nylon 66 prepreg was used in place of the complicated manufacturing process of the twisting process and the heat treatment process, thereby maintaining sufficient adhesive force and excellent heat shrinkage force with the tire rubber.

Prepreg is an abbreviation of Preimpregnated Materials. It is a sheet type product in which a matrix is pre-impregnated with Reinforced Fiber. It is an intermediate material of composite products. As the reinforcing fiber, carbon fiber, glass fiber, aramid fiber, nylon fiber and the like are mainly used. As the thermosetting resin, epoxy resin, acrylate resin and the like can be used as the binder. As the thermoplastic resin, polyamide, polyester Resin or the like can be used. The preferred reinforcing fiber in the present invention is nylon 66 fiber. As the binder, any one of epoxy resin and acrylate resin may be used, but the scope of the present invention is not limited thereto.

The composite material produced by using the prepreg is superior in strength, stiffness, corrosion resistance, fatigue, wear resistance, impact resistance, light weight weight reduction and the like, it is widely used in the production of aerospace industry, general industry, sports leisure goods and the like in recent years.

The reason why the prepreg is applied to the composite material molding can be found in the performance and the price. In terms of physical properties, the content and arrangement of the reinforcing material (reinforcing fiber) can be accurately controlled, , A molded product having a high fiber volume ratio can be produced, and the molded product has excellent mechanical strength, thereby realizing optimal physical properties and lightening the parts. Compared with other composites forming processes, the process of forming composite materials using prepregs is characterized by the fact that the cost of raw materials is high due to the use of intermediate materials, but the molding process is simple and simple, thereby reducing the process cost have. Because prepreg is mainly in sheet form, it is easy to handle, reduces energy costs in molding, and cuts the number of parts required for machining due to the nature of the cutting process. It can be used in aerospace, automobile, sports / leisure, And is widely used as an intermediate material for composite molding in various industrial fields.

As described above, the prepreg can be classified into a thermosetting prepreg to which a thermosetting resin is applied and a thermoplastic prepreg to which a thermoplastic resin is applied. In the early stage of prepreg development, a thermosetting prepreg which is relatively easy to manufacture has been mainly used. And the use of recyclable thermoplastic prepregs is increasing. The thermoplastic prepreg may be prepared by a method such as a film process, a powder coating process, a co-mingled yarn process, a direct melt process, Solution process. However, considering the economical efficiency, easiness of production, and the quality of the molding, the film method is widely used.

1 shows a partial cross-sectional view of the structure of a tire for a passenger car manufactured by using a nylon 66 prepreg according to the present invention as a cap ply.

1, the bead region 35 of the tire 31 becomes an annular bead core 36 which is non-stretchable. The bead core 36 is preferably made of a single filament wire wound continuously. In a preferred embodiment, the high strength steel wire having a diameter of 0.95 mm to 1.00 mm has a 4x4 structure or a 4x5 structure. In an embodiment of the tire cord according to the present invention, the bead region 35 may have a bead filler 37, the bead filler 37 should have a hardness above a certain level, preferably a Shore A hardness Shore A hardness) Hardness of 40 or more.

According to the invention, the crown portion can be reinforced by the belt structure 38 and the cap ply 39. The belt structure 38 includes a cut belt ply 40 comprised of two belt cords 41 and 42 and the belt cords 41 of the belt ply 40 comprise about 20 Lt; RTI ID = 0.0 > °. ≪ / RTI > One belt cord 41 of the belt ply 40 may be disposed opposite the direction of the belt cord 42 of the other belt ply 40 in a direction opposite the circumferential center plane. However, the belt structure 38 may comprise any number of plys and may preferably be arranged in a range of 16 to 24 degrees. The belt structure 38 serves to provide lateral stiffness to minimize the rise of the tread 33 from the road surface during operation of the tire 31. [ The belt cords 41, 42 of the belt structure 38 can be made of steel cords and have a 2 + 2 structure, but can be made of any structure. The cap ply 39 and the edge ply 44 are reinforced on the upper portion of the belt structure 38 so that the cap ply cords 45 of the cap ply 39 are reinforced in parallel with the circumferential direction of the tire, The cap ply cords 45 of the cap ply 39 having a large heat shrinking stress at a high temperature are used. The cap ply cords 45 of the cap ply 39 are nylon 66 fibers prepared in accordance with the method of the present invention and have a thickness of 0.001 mm to 100 mm and a width of 5 mm to 100 mm, And can be manufactured using a cap ply prepreg characterized by high shrinkage stress and adhesion. One layer of cap ply 39 and one layer of edge ply 44 may be used, and preferably one or two layers of cap ply and one or two layers of edge ply may be reinforced.

1, reference numerals 32 and 34 denote a carcass layer 32 and a fly turn 34. And reference numeral 33 denotes a carcass layer reinforcing cord 33. [

The features and advantages of the present invention will become more apparent from the following detailed description. Prior to this, terms and words used in the present specification and claims are to be interpreted in accordance with the technical idea of the present invention based on the principle that the inventor can properly define the concept of the term in order to explain his invention in the best way. It must be interpreted in terms of meaning and concept.

Example 1

Solid phase polymer chips were prepared so that the nylon 66 polymer had a sulfuric acid relative viscosity of 3.5 (sulfuric acid: 96% solution), and the nylon 66 flat fiber was obtained by spinning and stretching. The fibers are aligned with a thickness of 1 mm and a width of 50 mm and impregnated with an epoxy resin (National Chemical Industries Bisphenol A type epoxy resin), followed by obtaining a nylon 66 prepreg, and then making a cap fly. At this time, the content of the epoxy resin is 30 wt% based on the total weight of the prepreg.

Example 2

Solid phase polymer chips were prepared so that the nylon 66 polymer had a sulfuric acid relative viscosity of 3.5 (sulfuric acid: 96% solution), and the nylon 66 flat fiber was obtained by spinning and stretching. The fibers are aligned with a thickness of 1 mm and a width of 50 mm, impregnated with an epoxy resin (National Chemical Industries Bisphenol F type epoxy resin), obtained nylon 66 prepreg, and then made into a cap fly. At this time, the content of the epoxy resin is 30 wt% based on the total weight of the prepreg.

Example 3

Solid phase polymer chips were prepared so that the nylon 66 polymer had a sulfuric acid relative viscosity of 3.5 (sulfuric acid: 96% solution), and the nylon 66 flat fiber was obtained by spinning and stretching. The fibers are aligned with a thickness of 1 mm and a width of 50 mm, impregnated with an epoxy resin (Hydrogenated Bisphenol-A type epoxy resin, National Chemical Industries Co., Ltd.), followed by obtaining a nylon 66 prepreg, At this time, the content of the epoxy resin is 30 wt% based on the total weight of the prepreg.

Example 4

Solid phase polymer chips were prepared so that the nylon 66 polymer had a sulfuric acid relative viscosity of 3.5 (sulfuric acid: 96% solution), and the nylon 66 flat fiber was obtained by spinning and stretching. The fibers were aligned with a thickness of 1 mm and a width of 50 mm, impregnated with an acrylate resin (urethane acrylate resin of Huizhou Changrunfa Paint Co., Ltd., ytm4800), followed by obtaining a nylon 66 prepreg, . At this time, the content of the epoxy resin is 30 wt% based on the total weight of the prepreg.

Example 5

Solid phase polymer chips were prepared so that the nylon 66 polymer had a sulfuric acid relative viscosity of 3.5 (sulfuric acid: 96% solution), and the nylon 66 flat fiber was obtained by spinning and stretching. The fibers were aligned with a thickness of 1 mm and a width of 50 mm and impregnated with an acrylate resin (polyester acrylate resin, ytm1306, manufactured by Huizhou Changrunfa Paint Co., Ltd.), followed by obtaining a nylon 66 prepreg, do. At this time, the content of the epoxy resin is 30 wt% based on the total weight of the prepreg.

Comparative Example 1

A nylon 66 polymer was prepared so that the relative viscosity of sulfuric acid was 3.5 (sulfuric acid: 96% solution), and the nylon 66 fiber having a circular cross section was obtained by spinning and stretching. The obtained nylon 66 fibers were each spun at 1500 denier / twin, and the tensile strength at the twisting was maintained at the level of 200 g. The training period was 360 TPM.

The obtained raw cord was dried at 150 캜 for 130 seconds and passed through an adhesive liquid prepared by the following method to give an adhesive liquid. A 1.5% stretch was applied at the time of drying to control the generation of unevenness of raw cord due to heat shrinkage, and heat treatment was performed at 200 ° C for 1 minute.

29.4 wt% resorcinol 45.6 parts by weight

Pure water 255.5 parts by weight

37% formalin 20 parts by weight

10 wt% sodium hydroxide 3.8 parts by weight

After preparing the above solution, the mixture is reacted at 25 DEG C for 5 hours with stirring, and then the following components are added.

40 wt% VP-latex 300 parts by weight

Pure water 129 parts by weight

28% ammonia water 23.8 parts by weight

After the components were added, the mixture was aged at 25 ° C for 20 hours to maintain a solid concentration of 19.05%.

After the adhesive liquid was applied, it was dried at 160 ° C for 2 minutes and then heat-treated at 249 ° C for 1 minute to finish the adhesive treatment.

The properties of the thus-prepared dip cords were evaluated and are shown in Table 1.

A cap ply was prepared using the dip cord.

Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1



tire



Kakas PET
1500d / 2 PET
1500d / 2 PET
1500d / 2 PET
1500d / 2 PET
1500d / 2 PET
1500d / 2 Cap fly prepreg capply prepreg capply prepreg capply prepreg capply prepreg capply nylon 1260d / 2 Flat rate 0.6 0.6 0.6 0.6 0.6 0.6 Number of carcass layers One One One One One One Cap fly layer number One One One One One One Ride comfort 95 90 95 90 90 100 Steering stability 90 95 90 95 90 95 durability OK OK OK OK OK OK Uniformity 92 90 94 91 92 95

The cap ply prepared according to the above Examples and Comparative Examples was evaluated by applying it to 215/65 R 16 V tires under the conditions of Table 1. The steerability and ride quality were evaluated by a trained driver on a test course of 5 out of 100 points, and durability was measured according to FMVSS 109 P-Metric tire durability test method.

The tires to which the prepreg cap ply of the embodiment as shown in Table 1 was applied are evaluated to have similar steering stability, ride comfort and durability when compared to the tires using the existing nylon 66 cap ply, . In addition, since the twisting process and the dipping process can be omitted, the tire can be produced at a low cost.

31: Tire 32: Carcass layer
33: Carcass layer reinforcement cord 34: Fly turn-up
35: bead region 36: bead core
37: bead filler 38: belt structure
39: cap fly 40: belt fly
41, 42: belt cord 43: tread
44: edge fly 45: cap fly cord

Claims (4)

A method of manufacturing a cap ply for radial tires,
A method for producing a nylon 66 prepreg cap ply, characterized in that nylon 66 flat fibers are aligned with a thickness of 0.001 to 2 mm and a width of 5 to 100 mm and then impregnated with a matrix resin.
The method according to claim 1,
Wherein the matrix resin is one selected from the group consisting of an epoxy resin and an acrylate resin.
A nylon 66 prepreg cap fly made by the method of claim 1 or 2.
A tire comprising the nylon 66 prepreg cap ply of claim 3.

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