KR101457865B1 - Innerliner for tire and tire comprising the same - Google Patents

Abstract

The tire inner liner of the present invention comprises 100 parts by weight of a polymer component comprising 30 to 70 parts by weight of a thermoplastic resin and 30 to 70 parts by weight of an elastomer and 1 to 5 parts by weight of graphene powder.
The tire inner liner can reduce the weight of the tire, simplify the manufacturing process, and reduce the rolling resistance to improve the fuel consumption.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a tire inner liner,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a tire inner liner and a tire including the inner liner. More particularly, the tire inner liner is a tire inner liner that can reduce the weight of a tire, simplify a manufacturing process, A liner and a tire including the same.

As radial tires drove the market for bias tires, polyester cords were used for radial tire kakas, and nylon 66 cords were used for cap fly to improve radial tire performance.

Radial tires have been used as tubeless tires by bonding a layer made of butyl rubber composition, which is a conventional tube material, inside a tire without using a separate tube to maintain the air pressure unlike the conventional one.

When the inner liner is applied, it is necessary to formulate the butyl rubber composition and to roll it to the required width. If the butyl rubber is mixed with other rubber in the process, there is a risk that it can lead to a very dangerous accident.

On the other hand, if the finished film is used as an inner liner substitute in the outside of the tire factory, it is possible to prevent the occurrence of defects or tire accidents due to careless use of semi-finished products in the tire factory, , It is possible to reduce the utility cost of securing the space inside the factory and managing the facilities. In addition, it is possible to reduce the weight of the tire due to the very thin thickness of the conventional butyl rubber inner liner, which can reduce the rotation resistance and improve the fuel efficiency of the vehicle. Therefore, there is a great demand for a film that can be used as an inner liner substitute as described above.

Korean Patent Publication No. 2000-0046696 (published on July 25, 2000) Korean Patent Publication No. 1999-0016806 (published on March 15, 1999) Korean Patent Publication No. 2008-0056926 (published on June 24, 2008)

An object of the present invention is to provide a tire inner liner capable of reducing the weight of a tire, simplifying a manufacturing process, and reducing a rotational resistance to improve fuel economy.

Another object of the present invention is to provide a tire comprising the tire inner liner.

In order to achieve the above object, a tire inner liner according to an embodiment of the present invention comprises 100 parts by weight of a polymer component comprising 30 to 70 parts by weight of a thermoplastic resin and 30 to 70 parts by weight of an elastomer, and 1 to 5 parts by weight of a graphene powder .

The thermoplastic resin may be a polyurethane resin, and the elastomer may be nylon.

The thickness of the tire inner liner may be 50 to 300 mu m.

The tire inner liner may have an adhesive layer formed on one surface thereof.

The adhesive layer may be formed by applying a resorcinol formaldehyde latex including a terpene resin to one surface of the innerliner of the tire, followed by heat treatment.

The heat treatment may be performed at 200 캜 or lower.

The resorcinol formaldehyde latex comprising the terpene resin may include 100 parts by weight of resorcinol formaldehyde and 10 to 50 parts by weight of the terpene resin.

The resorcinol formaldehyde latex comprising the terpene resin is obtained by reacting 50 to 200 parts by weight of vinylpyridine latex, 3 to 10 parts by weight of an aqueous ammonium hydroxide solution and 0.5 to 2 parts by weight of an aqueous solution of sodium hydroxide per 100 parts by weight of the resorcinol formaldehyde aqueous solution Water, 20 to 50 parts by weight of water, and a mixture thereof.

And a tire inner liner according to another embodiment of the present invention.

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

A tire inner liner according to an embodiment of the present invention comprises 100 parts by weight of a polymer component comprising 30 to 70 parts by weight of a thermoplastic resin and 30 to 70 parts by weight of an elastomer and 1 to 5 parts by weight of graphene powder.

The inner liner of the tire includes a thermoplastic resin, an elastomer and a graphene instead of the butyl rubber composition which is used as a conventional tire inner liner in order to reduce noise and ride comfort, thereby reducing the weight of the tire, simplifying the manufacturing process, The fuel consumption can be improved by reducing the resistance.

The thermoplastic resin may be a polyamide resin such as nylon 6 (N6), nylon 66 (N66), nylon 46 (N46), nylon 11 (N11), nylon 12 (N12), nylon 610 (N610) , Nylon 612 (N612), Nylon 6/66 Copolymer (N6 / 66), Nylon 6/66/610 Copolymer (N6 / 66/610), Nylon MXD6 (MXD6), Nylon 6T, Nylon 6 / 6T Copolymer , Nylon 66 / PP copolymer, nylon 66 / PPS copolymer), polyester resins (for example, polybutylene terephthalate (PBT), polyethylene terephthalate (PET) (PEI), a PET / PEI copolymer, a polyallylate (PAR), a polybutylene naphthalate (PBN), a liquid crystal polyester, a polyoxyalkylene diimide polyoxy alkylene diimide acid / polybutylate terephthalate copolymer Aromatic polyesters), poly nitrile resins (for example, polyacrylonitrile (PAN), polymethacrylonitrile, acrylonitrile / styrene copolymer (AS), methacrylonitrile / Styrene copolymer, methacrylonitrile / styrene / butadiene copolymer), poly methacrylate resin (for example, polymethyl methacrylate (PMMA), polymethyl methacrylate) A resin such as vinyl acetate (EVA), polyvinyl alcohol (PVA), vinyl alcohol / ethylene copolymer (EVOH), polyvinylidene chloride (PVDC), polyvinyl chloride (PVC), vinyl chloride / Polyvinylidene chloride (PVDF), polyvinylidene fluoride (PVF), polyvinylidene fluoride (PVF), polyvinylidene fluoride (PVF) Tetrafluoroethylene / ethylene (ETFE), an imide resin (e.g., aromatic polyimide (PI)), and the like.

The elastomer may be at least one selected from the group consisting of diene rubbers and additives thereof such as NR, IR, epoxidized natural rubber, SBR, BR (gossy BR and low sheath BR), NBR, hydrogenated NBR, hydrogenated SBR) , Ethylene-propylene rubber (EPDM, EPM), maleic acid modified ethylene propylene rubber (M-EPM), IIR, isobutylene and an aromatic vinyl or diene monomer copolymer, acrylic rubber (ACM) (Br-IPMS), chloroprene rubber (Br-IIR), chlorinated butyl rubber (Cl-IIR), isobutylene para-methyl styrene copolymer chloroprene rubber (CR), hydrine rubber (CHR, CHC), chlorosulfonated polyethylene (CSM), chlorinated polyethylene (CM), maleic acid modified chlorinated polyethylene (M-CM) Methyl vinyl silicone rubber, dimethyl silicone rubber, methylphenyl vinyl silicone rubber), fire (For example, vinylidene fluoride rubber, fluorinated vinyl ether rubber, fluorinated silicone rubber, fluorinated phosphazene rubber), thermoplastic elastomer (for example, styrene elastomer, polyolefin elastomer, polyester elastomer , Polyurethane-based elastomer, polyamide-based elastomer), and the like.

In particular, the thermoplastic resin may be a polyurethane resin, and the elastomer may be nylon. When the thermoplastic resin is a polyurethane resin and the elastomer is nylon, the effect of using the graphene powder can be enhanced.

The polymer component may include 30 to 70 parts by weight of the thermoplastic resin and 30 to 70 parts by weight of the elastomer. If the content of the thermoplastic resin is less than 30 parts by weight or the content of the elastomer is more than 70 parts by weight, the air permeability may be decreased. If the content of the thermoplastic resin exceeds 70 parts by weight or the content of the elastomer is less than 30 parts by weight , The flexibility of the tire inner liner may be deteriorated.

The graphene powder is a material in which the layer structure of graphite is divided into layers, and when it is included in the innerliner of the tire, it can block air-permeable gaps and improve air permeability.

The tire inner liner may include 1 to 5 parts by weight of the graphene powder per 100 parts by weight of the polymer component. When the content of the graphene powder is less than 1 part by weight, air permeation may occur well. When the content of the graphene powder is more than 5 parts by weight, the graphene powder may be nonuniformly mixed.

The tire inner liner is prepared by dissolving the thermoplastic resin, elastomer and graphene powder in a solvent, preferably dimethylformaldehyde (DMF) to prepare a mixed solution, and then the mixed solution is cast and stretched to a thickness of 50 to 300 μm Film.

If the concentration of the mixed solution is low, a film having a low thickness can be produced. However, if the thickness of the film is made thinner, sufficient physical properties may not be exhibited unless the solvent is sufficiently recovered after casting the film.

In this case, since the orientation of the thermoplastic resin is exhibited and the modulus of the film in the transverse direction and in the axial direction is higher than that of the film obtained by casting, The film may be broken at the time of deformation due to bladder expansion in the molding process.

An adhesive layer may be formed on one surface of the tire inner liner. That is, in order to use the produced film as an inner liner of a tire, it is necessary to impart adhesion performance to rubber.

The adhesive layer may be formed by applying a resorcinol formaldehyde latex including a terpene resin to one surface of the innerliner of the tire, followed by heat treatment. At this time, the heat treatment may be performed at less than 200 ° C. When the heat treatment temperature is 200 ° C or higher, the dimension of the resorcinol formaldehyde latex layer may be deformed.

Specifically, resorcinol formaldehyde latex (RFL), which includes a tackifier, is applied to one side of the tire innerliner so that the tire innerliner may be physically attached to the rubber. Since the elastomer can chemically react with the resorcinol formaldehyde latex, it is possible to use the resorcinol formaldehyde latex as an adhesive.

Further, the pressure-sensitive adhesive may exhibit fairness during the molding process of the green tire, and the pressure-sensitive adhesive may be preferably a terpene resin. To this end, the resorcinol formaldehyde latex comprising the terpene resin may include 10 to 50 parts by weight of the terpene resin per 100 parts by weight of the resorcinol formaldehyde.

The resorcinol formaldehyde latex comprising the terpene resin is obtained by reacting 50 to 200 parts by weight of vinylpyridine latex (solid content 31 to 51% by weight), ammonium hydroxide aqueous solution (solid content 18 And 3 to 10 parts by weight of a sodium hydroxide aqueous solution (solid content: 40 to 60% by weight), 0.5 to 2 parts by weight of water, 20 to 50 parts by weight of water, and a mixture thereof .

The vinylpyridine latex enables vulcanization bonding with the rubber compound in the adhesive layer. When the content of the vinylpyridine latex is less than 50 parts by weight, adhesion between the adhesive layer and the inner liner may be poor. When the content exceeds 200 parts by weight, The adhesion with the cord may be poor.

If the content of the sodium hydroxide aqueous solution is less than 0.5 parts by weight, the resorcinol formaldehyde latex may take a long time to aged. If the content of the resorcinol formaldehyde latex is more than 2 parts by weight, aging may occur rapidly and viscosity control may be difficult.

When the content of the ammonium hydroxide aqueous solution is less than 3 parts by weight, mixing of the resorcinol formaldehyde and the vinylpyridine latex may be difficult. When the amount of the aqueous solution is more than 10 parts by weight, the pH may be changed and the resorcinol formaldehyde latex may be aged . ≪ / RTI >

The tire inner liner having the adhesive layer formed thereon has adhesiveness and can be directly applied in the tire molding process without the rolling process. Therefore, when the tire inner liner is applied, it becomes unnecessary to attach the inner liner to the tire through the mixing and rolling process like the conventional butyl rubber inner liner, so that the manufacturing process of the tire can be simplified.

In addition, since the inner liner of the tire can lower the thickness of the inner liner of the tire than the conventional butyl rubber inner liner, the weight of the tire can be reduced. Recently, various attempts have been made to improve the fuel efficiency by lowering the weight of the tire. However, if the thickness of the tread is reduced, there is a problem in the drainage performance and mileage, and if the thickness of the cords is narrowed, . However, when replacing the butyl rubber inner liner with the inner tire liner, the tire can be lightweight without problems in performance.

A tire according to another embodiment of the present invention includes the tire inner liner. The tire inner liner may be disposed inside or outside the carcass layer, or at other locations.

The tire inner liner of the present invention can reduce the weight of the tire, simplify the manufacturing process, and reduce the rolling resistance to improve the fuel consumption.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

[ Manufacturing example : Preparation of rubber composition]

In Comparative Example 1, a butyl rubber composition was used as an inner liner. In Example 1, a film (thickness: 100 탆) comprising nylon 6 / thermoplastic polyurethane / graphene powder mixture was used as an inner liner. The inner liner of Example 1 contained 50 parts by weight of the nylon 6, 50 parts by weight of the thermoplastic polyurethane, and 1 part by weight of the graphene powder.

The innerliner of the tire of Example 1 was applied to the tire using an adhesive layer formed by applying an adhesive and heat-treated at 200 DEG C, and the adhesive was composed of 100 parts by weight of resorcinol formaldehyde, an aqueous solution of ammonium hydroxide , 5 parts by weight of vinylpyridine latex (solid content: 40% by weight), 20 parts by weight of water, 28 parts by weight of water, 85 parts by weight of water, 1 part by weight of sodium hydroxide aqueous solution (solid content: 50% by weight) and 10 parts by weight of terpene resin Respectively.

[ Experimental Example : Measurement of physical properties of the prepared rubber composition]

Table 1 below shows the results of evaluating the room test, the actual vehicle performance test, the rolling resistance, and the like using the tire (205 / 55R16) including the inner liner manufactured in the above Examples and Comparative Examples.

Comparative Example 1 Example 1 Inner liner composition Butyl rubber composition Nylon 6 / thermoplastic polyurethane / graphene powder Inner Liner Thickness 2mm 0.1mm standard 205 / 55R16 Steering safety 100 99 Ride comfort 100 101 noise 100 98 Rotation resistance 7.7 7.1 Weight (kg) 10.8 10.1

In Table 1, steering stability, ride comfort, and noise were measured through actual vehicle tests, and the rotational resistance was measured using a rotational resistance tester.

Referring to Table 1, it can be seen that the inner liner manufactured in the example exhibits the same performance without significant difference in the performance part as compared with the inner liner of the comparative example, but has an effect of decreasing the weight and reducing the rolling resistance.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

Claims (9)

Based on 100 parts by weight of a polymer component comprising 30 to 70 parts by weight of a thermoplastic resin and 30 to 70 parts by weight of an elastomer,
1 to 5 parts by weight of graphene powder
The inner liner comprising: The method according to claim 1,
Wherein the thermoplastic resin is a polyurethane resin, and the elastomer is nylon. The method according to claim 1,
Wherein the thickness of the innerliner of the tire is 50 to 300 占 퐉. The method according to claim 1,
Wherein the tire inner liner has an adhesive layer formed on one surface thereof. 5. The method of claim 4,
Wherein the adhesive layer is formed by applying a resorcinol formaldehyde latex including a terpene resin to one side of the tire innerliner and then heat-treating the same. 6. The method of claim 5,
Wherein the heat treatment is performed at 200 DEG C or less. 6. The method of claim 5,
Wherein the resorcinol formaldehyde latex comprising the terpene resin comprises 10 to 50 parts by weight of a terpene resin per 100 parts by weight of resorcinol formaldehyde. 8. The method of claim 7,
The resorcinol formaldehyde latex comprising the terpene resin is obtained by reacting 50 to 200 parts by weight of vinylpyridine latex, 3 to 10 parts by weight of an aqueous ammonium hydroxide solution, 0.5 to 2 parts by weight of an aqueous solution of sodium hydroxide with respect to 100 parts by weight of the resorcinol formaldehyde 20 to 50 parts by weight of water, and a mixture thereof. ≪ Desc / Clms Page number 24 > A tire comprising a tire inner liner according to claim 1.