JPS5953207A - Seal for tire - Google Patents

Abstract

PURPOSE:To make a clear-cut decorative effect maintainable for a long period of time, by making up a seal to be stuck to a sidewall part of a tire with an antioxidant permeating inhibitory resin layer laminted on the surface of a seal base material and a protector film laminated on this layer's surface. CONSTITUTION:In case of a seal 1 for tire use to be stuck to a sidewall part 3 of a tire 2, the seal 1 consists of an antioxidant permeating inhibitory resin layer 5 solidly and lamellately set to the surface of a seal base material 4 and a protector film 6 solidly and lamellately applied to the surface of this resin layer 5. At this time, an unvulcanized rubber sheet 7 is set to the side of a surface sticking to the sidewall part 3 of the seal base material 4, and a vulcanizing bonding agent is applied to both 3 and 7 whereby they are bonded together. With this, an amine system antioxidant of the sidewall part 3 is kept from permeating the seal base material 4 by means of the said resin layer 5 so that discoloration due to oxidization of the antioxidant is checked by the protector film 6 and a decorative effect for the tire seal 1 can be maintained for a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tire sticker that is attached to a sidewall portion of a tire primarily for decorative purposes.

In recent years, as automobiles have become more decorative, there has been a strong desire for decorative sidewalls of tires.

Therefore, several methods have been proposed for decorating the sidewall of a tire by forming letters or figures in a color other than black, such as white or red. For example, a method of forming letters, etc. on the sidewall portion by embedding white rubber blocks during the manufacturing process of the tire body and then vulcanization molding has been adopted in a very small number of high-end tires. However, this method has the drawback that it takes a lot of time to manufacture the tires and the manufacturing cost is also extremely high. moreover.

The biggest drawback is that it is molded during manufacturing.

Only a single decoration was available, and it was completely impossible for the user to decorate as desired to suit his or her personality.

To overcome this drawback, various tire seals, generally called point letters, rubber pads, rubber tags, etc., have been proposed. This type of seal has a structure in which an adhesive is applied to a sealing base material made of soft vinyl, soft rubber, or the like, which has the flexibility to deform in accordance with the deformation of the tire.

However, with a seal configured like this.

Since the sealing base material and the tire surface are in direct contact with each other, the sealing material and the tire surface are in direct contact with each other, so in just one to two weeks after being attached to the sidewall part of the tire, the sealing base material and the tire surface are in direct contact with each other. The contaminating amine-based anti-aging agent blended into etc. diffuses onto the surface of the seal base material, turning red into black and -! White paper had the disadvantage of discoloring to brown and becoming extremely poor in appearance.

Amine-based anti-aging agents plume over the tire surface,
Since it has an important function of suppressing the occurrence and growth of cracks caused by aging on the tire surface, it is impossible to solve this problem by discontinuing the addition of amine-based anti-aging agents to tires. It was.

The present invention improves the above-mentioned drawbacks, and aims to provide a tire seal that significantly suppresses the phenomenon of discoloration of the seal surface due to the diffusion and transfer of anti-aging agents, and has a clear decorative effect for an extremely long period of time. .

The present invention relates to a tire seal that is attached to the sidewall of a tire, and includes a sealing base material arranged so as to be located on the sidewall side of the tire, and a sealing base material integrally laminated on the surface of the sealing base material. This tire seal is characterized by having an anti-aging agent permeation inhibiting resin layer and a protective coating integrally laminated and coated on the surface of the anti-aging agent permeation inhibiting resin layer.

Here, the sealing base material includes natural rubber, synthetic polyisoprene rubber, styrene-butadiene copolymer rubber, polybutadiene rubber, ethylene-propylene-diene terpolymer rubber, and butyl rubber.

It is preferable to use a rubber composition in which one or more diene rubbers such as halogenated butyl rubber, acrylonitrile-butadiene rubber, and chloroprene rubber are selected as the rubber component, but thermoplastic polyester resin, thermoplastic polyurethane elastomer, or thermosetting A synthetic resin base material such as polyurethane elastomer may also be used. This sheet base material is used in white or chromatic color.

Since the seal needs to deform itself following the deformation of the tire, its hardness is preferably 30° to 60°Hs.

More preferable is approximately 35° to 45°I-Is.

The hardness test was based on JIS K 6301 spring type hardness test (doll).

The antiaging agent permeation suppressing resin layer is made of polyethylene, polypropylene, polyvinyl chloride, or polyester.

Although polyamide Izun can also be used, according to the study by the present inventors as described below, nylon 12 or nylon 1
It has been confirmed that No. 1 is preferable in terms of antioxidant permeation inhibiting effect and durability.

The purpose of the protective film is to prevent the anti-aging agent permeation-suppressing resin layer from coming into direct contact with the air and to block oxygen, and coating the surface of the anti-aging agent permeation-suppressing resin layer with the protective film will prevent the seal from discoloring. can be suppressed for a long period of time.

Furthermore, the protective coating functions as a colored layer to decorate the tire sticker. The protective coating may be colored in any color as long as it has a brightness and/or saturation that provides a decorative effect that distinguishes it from the black background of the tire.

In addition, if the anti-aging agent permeation suppressing resin layer and protective film are transparent,
It is possible that the seal base material changes color due to UV transmission.

5- Therefore, from this point of view as well, it is preferable to color the protective coating.

The protective coating may be either a polyurethane resin or a diene rubber composition. As the polyurethane resin, a thermoplastic polyurethane resin or a polyurethane paint is used, but a non-yellowing polyurethane using a non-yellowing polyisocyanate (for example, hexamethylene diisocyanate) is preferable because it does not cause yellowing.

Polyurethane paints include non-yellowing oil-modified polyurethane paints, non-yellowing moisture-curing paints, non-yellowing -component thermosetting paints, non-yellowing two-component catalyst-curing paints, and non-yellowing two-component polyol-curing paints. Paints such as mold paints can also be suitably used.

It is preferable to use polyurethane paint because the coating can be made thinner, less likely to peel off, and easier to color.

The present invention will be explained in detail below with reference to the drawings.

1 and 2 show a state in which a tire sticker 1 is adhered to a sidewall portion 3 of a tire 2. FIG.

The sealing base material 4 should have a thickness between 0.3 and 1.5 mm in order to alleviate the deformation stress on the anti-aging agent permeable resin layer 5 (hereinafter referred to as 6-layer 5) and the protective coating 6 to some extent and to create a three-dimensional effect. is hopeful.

It is more desirable if it is approximately in the 1st key.

The layer 5 is integrally laminated and adhered to the surface of the seal base material 4, but if a rubber composition or thermosetting polyurethane elastomer is used for the seal base material 4, it is bonded with an adhesive such as a polyurethane adhesive. If thermoplastic polyester resin or thermoplastic polyurethane elastomer is used, heat-fusion may be used.

As the adhesive, any adhesive such as a natural rubber adhesive, an acrylic adhesive, or other synthetic resin adhesive may be used in addition to a polyurethane adhesive.

For example, if layer 5 is made of nylon 12, the thickness of one layer is 1
It should be between 0μ and 150μ. If it is less than 10μ, the effect of suppressing the permeation of the anti-aging agent will be reduced, and if it exceeds 150μ, the flexibility of the tire seal 1' as a whole will be impaired and it will become easy to peel off. Preferably, the thickness is about 60μ.

The protective coating 6 coated on the surface of the layer 5 should have a thickness of 10 μm or more to block oxygen. If it exceeds 200 μm, it is not preferable because it becomes easy to cut. For example, in the case of a polyurethane resin coating, approximately 50μ is more preferable.

To form a polyurethane resin film, if a polyurethane paint is used, it can be applied to layer 5 as appropriate, or if a sheet of thermoplastic polyurethane resin is used, the resin sheet can be laminated on layer 5 and then heat-fused. good.

In order to form the diene rubber composition film, it is sufficient to apply, for example, naturally vulcanized rubber paste to the surface of the layer 5.

Next, a preferred embodiment for adhering the tire sticker 1 to the sidewall portion 3 of the tire 2 will be described.

An unvulcanized rubber sheet 7 is placed on the surface of the sidewall portion 3 of the small seal base material 4 on the side to be adhered to.

This unvulcanized rubber sheet) 1-j: A diene rubber, for example, natural rubber as a base material, which contains sulfur, a vulcanizing agent such as 4,4"-dithiopisu dimorpholine or alkylphenol disulfide, and zinc white. It is an unvulcanized rubber sheet containing vulcanization aids such as stearic acid, silica, clay, fillers such as calcium carbonate, magnesium carbonate, carbon black, etc. in an appropriate formulation, and accelerates vulcanization to prevent vulcanization. Agents are not usually included.

Tire seal 1 on which the unvulcanized rubber sheet 7 described above is arranged
When attaching the tire to the tire, a vulcanizing adhesive containing a vulcanization accelerator is applied to both the sidewall portion 3 and the unvulcanized rubber sheet 7, and then the tire is attached and pressure-bonded.

By this operation, the unvulcanized rubber sheet 7 starts a vulcanization reaction, and the sidewall portion 3 of the tire 2 and the sheet base material 4 of the tire seal 1 are substantially vulcanized and bonded together, which is preferable. .

As the vulcanization accelerator used in vulcanizable adhesives, dithiocarbamates and chitin dobunates, which can be naturally vulcanized, are usually used. As the vulcanizing adhesive, a naturally vulcanized rubber paste which is normally available on the market may be used.

A method for attaching the twisted sidewall portion 3 and the seal base material 4 is to apply a commercially available rubber adhesive 1 such as Diamondpond (manufactured by Nogawa Chemical, trade name) to both sides or the surface of the seal base material 4, and then press or heat the adhesive. It may be crimped.

The tire seal of the present invention having the above structure prevents the amine-based anti-aging agent in the tire sidewall portion from permeating the seal base material 4 and diffusing to the seal surface with the anti-aging agent permeation suppressing resin layer 5. Furthermore, the protective film coated on the surface of layer 5 effectively blocks oxygen in the air, so discoloration due to oxidation of the anti-aging agent is effectively suppressed.

This significantly improves the decorative effect of tire seals over a long period of time.

Hereinafter, it will be explained in more detail with reference to Examples.

Example A white natural rubber rubber with a thickness of 1 tnm was used as the seal base material.
EXAMPLE 1 Using a sheet-like nylon 12 sheet with a thickness of 60 μm as an anti-aging agent permeation suppressing layer, tire stickers of type A-B510 shown below were prepared as prototypes and adhered to tires.

Tire seal A: Only white rubber is unvulcanized.
Comparative Example) Vulcanized adhesive was applied to a tire using a method.

Tire Seal B A seal formed by applying a white polyurethane resin film (comparative example) to an unvulcanized rubber sheet to a thickness of 50 μm was vulcanized and adhered to a tire.

Tire Seal C White polyurethane on white rubber (comparative example) A seal formed by applying a resin film to a thickness of 50 μm was vulcanized and adhered to the tire using an unvulcanized rubber sheet on the white comb side.

Tire Seal D A seal in which a sheet of nylon 12 (comparative example) was laminated on white rubber was vulcanized and adhered to the tire with the white rubber side using an unvulcanized rubber sheet.

Seal E for Tires Nylon 12 is laminated on white rubber (Example) Layers are arranged and a white polyurethane resin film is applied to the surface of Nylon 12 to a thickness of 50 μm. A seal is formed on the white rubber side of the tire using an unvulcanized rubber sheet. It was vulcanized and adhered to.

After vulcanizing and adhering these five types of stickers to tires, a two-day sunlight exposure test was conducted to evaluate their color fastness.

Seal A turns brown after 10 days, and Seals B and D turn brown after 30 days.
Seal C turned brown after 55 days, while Seal E, which is an example of the present invention, turned brown after 55 days.
Even after 0 days, no discoloration was observed, indicating a significant improvement effect.

As with Seal E, the anti-discoloration effect is synergistically exhibited only when a protective film is formed on the anti-aging agent permeation layer.

In the above example, an unvulcanized rubber sheet was used as an example of attaching a sticker to a tire, but a commercially available rubber adhesive Diabond (trade name, manufactured by Nogawa Chemical) Approximately the same results were obtained with the adhesive.

In addition, as in the example, if an unvulcanized rubber sheet is laminated on a tire seal and the seal is attached to the tire by the vulcanization reaction of the unvulcanized rubber, the tire and the seal are essentially separated. Since it is integrated with the seal, it is possible to obtain a seal that does not peel off at all. Furthermore, if the sealing base material is made of white rubber as in the example.

This is used as a base color to mask the underlying black color.

To obtain a decorative effect of bright colors no matter what color is applied to the polyurethane resin coating.

[Brief explanation of drawings]

FIG. 1 is a front view showing a state in which the tire seal of the present invention is adhered to a tire, and FIG. 2 is an enlarged sectional view taken along line A--A in FIG. 1. 13- 1... Tire seal, 2... Tire. 3...Side fall portion, 4...Seal base material. 5... Antiaging agent permeation suppressing resin layer. 6...Protective coating, 7...Unvulcanized rubber sheet Patent applicant Brideston Tire Co., Ltd. Patent applicant Megumi Kondo, Ryo Ryo, Patent Attorney, Hide Kume − Patent Attorney, Patent Attorney Etsu Suzuki Part 14-

Claims (1)

[Claims] A tire seal that is attached to the sidewall of a tire includes a sealing base material disposed on the sidewall side of the tire, and an anti-aging agent laminated integrally on the surface of the sealing base material. A tire seal comprising a permeation-suppressing resin layer and a protective film integrally laminated and coated on the surface of the anti-aging agent permeation-suppressing resin layer.