KR20070095703A - The tire with tire sidewall improved the ozone crack and appearance - Google Patents

Abstract

A tire with a tire sidewall for improving ozone-resistant crack and appearance is provided to improve external appearance quality of the tire by coating plasma on the whole surface of a tire sidewall through a plasma device. A tire is manufactured by using a rubber composition. The tire is rotated to coat plasma(3) on the whole surface of a tire sidewall(1) by using a plasma device(2). The plasma is discharged by mixing gases such as oxygen, ammonia, nitrogen, vapor, and argon with the 0.05 to 10 liter/min of the plasma. A constant pressure and low temperature plasma device is used for plasma process.

Description

Tire with tire sidewall improved the ozone crack and appearance

1 shows a sidewall of a tire and a plasma apparatus.

<Description of the symbols for the main parts of the drawings>

1: sidewall

2: plasma device

3: plasma

The present invention relates to a tire having a tire sidewall having improved ozone crack resistance and appearance, and more particularly, to a tire sidewall having plasma-treated sidewall surfaces in order to improve ozone crack resistance and appearance quality of the tire sidewall portion. It is related with the provided tire.

In general, the sidewall portion of the tire is prone to ozone cracking because it has a long service life and flexes while exposed to the air. In addition, the chemicals move to the surface to move to the surface to reduce the appearance quality of the tire.

In order to overcome the above problems, a rubber composition containing ethylene-propylene-diene terpolymer (EPDM) having excellent ozone resistance may be used. However, EPDM rubber has a problem of poor adhesion with other rubbers and has a lot of problems such as changing the vulcanization system because the vulcanization time is later than other rubbers.

Another method is to add a large amount of ozone anti-aging agent. However, this also has no problem in the early stage, ozone crack may occur due to the loss of the anti-aging agent over time and the anti-aging agent is moved to the surface of the sidewall has a problem of deterioration of the tire appearance quality. In addition, a large amount of anti-aging agent is added, so the economic loss is large.

On the other hand, as a prior art of the present invention, Korean Patent Registration 10-0351008 (the rubber composition for the side wall of the tire) is the introduction of a high molecular weight ethylene-propylene-diene terpolymer in the sidewall rubber composition, Korean Patent Registration 10-0329122 (Sidewall rubber composition with improved ozone resistance) is a composition of the present invention having improved fatigue resistance by adding hexamethyl-1,6-bisthiosulfate disodium dihydrate (HBD) to the sidewall rubber composition. Different.

The present invention has been proposed to solve the problems of the prior art as described above, an object of the present invention is to provide a tire having a tire sidewall with improved ozone crack resistance and appearance by plasma treatment of the surface of the tire sidewall. have.

In order to achieve the above object, the present invention includes a tire having a tire sidewall in which the surface of the tire sidewall is plasma-treated.

The present invention also includes a tire having a tire sidewall, wherein the plasma treatment uses atmospheric pressure and a low temperature plasma apparatus.

Hereinafter, the present invention will be described in detail.

The present invention is ozone crack resistance by coating the surface of the finished tire tire after the vulcanization is finished by adding less amount of anti-aging agent to prevent ozone cracking or appearance deterioration of the existing sidewall using plasma. In order to improve the appearance quality while improving the.

In general, plasma refers to an ionized gas state composed of ions, electrons, radicals, and the like, which are generated by a very high temperature, a strong electric field, or a high frequency electromagnetic field. Particularly, plasma generation by glow discharge is performed by free electrons excited by direct current (DC) or high frequency electric field (RF). The excited free electrons collide with gas molecules to generate active groups such as ions, radicals, and electrons. active species). And such active groups physically or chemically act on the surface of the material to change the surface properties. In this way, intentionally changing the surface properties of the material by the active group (plasma) is called 'surface treatment'.

The object of the present invention is to improve the performance by coating the surface of the sidewall of the finished tire with the plasma generated by using a plasma device. The plasma is a material having excellent ozone resistance.

The rubber composition of the sidewall part when manufacturing the tire of the present invention is carbon black 45 to 55 phr, zinc oxide 1 to 5 phr, stearic acid 0.5 to 2.5 phr, ozone antioxidant 0.5 to 4.0 phr, process oil 0.5 to 10 phr based on 100 phr of raw rubber. It may contain 0.5 to 4.0 phr of wax.

In the above, the raw material rubber is preferably preferably used by using a mixture of natural rubber and synthetic rubber, and the mixing ratio may be used in a ratio of 40 to 60 parts by weight of natural rubber and 60 to 40 parts by weight of synthetic rubber, respectively.

In addition, the synthetic rubber is styrene butadiene rubber (SBR), butadiene rubber (BR), butyl rubber, epichlorohydrin rubber, nitrile rubber, hydrogenated nitrile rubber, brominated polyisobutyl isoprene-co-paramethyl styrene (BIMS), One or more selected from urethane rubber, fluorine rubber, silicone rubber, SEBS, ethylene propylene rubber, EPDM rubber, hypalon rubber, chloroprene rubber, ethylene vinyl acetate rubber, and acrylic rubber can be used.

After the tire is manufactured using the rubber composition, the plasma 3 is coated on the entire tire sidewall 1 while the tire is rotated using the plasma apparatus 2 (see FIG. 1). ).

The plasma treatment of the present invention preferably uses atmospheric pressure and low temperature plasma apparatus. In the present invention, the plasma discharge flows various gases such as oxygen, ammonia, nitrogen, water vapor, argon, etc. at a flow rate of 0.01 to 100 l / min, more preferably 0.05 to 10 l / min. The frequency of the power supply can be used with alternating current (AC), which is approximately 1 kHz to several GHz (better for 1 kHz to several tens of MHz). In embodiments of the present invention, frequencies in the range of 5 to 30 kHz may be used (see Registered Application 20-0395388).

Plasma technology used in the present invention can be applied to the functional surface of the material surface, surface modification, functional thin film production and the like. This technology is in the spotlight for energy saving and pollution-free processes. Plasma surface treatment technology is a technology that gives physicochemical characterization reaction to only the surface without affecting the basic physical properties of the material to impart functionality, and enables a continuous surface treatment process to increase productivity and economy.

Hereinafter, the contents of the present invention will be described in detail through examples. However, the following examples are intended to illustrate the present invention in more detail, and the scope of the present invention is not limited to these examples.

Comparative Example 1

50 phr of carbon black, 3 phr of zinc oxide, 1.5 phr of stearic acid, 4.5 phr of process oil, 2 phr of wax and sulfur 2.0 phr as a vulcanizing agent for 100 phr of natural rubber and synthetic rubber mixed with 50 to 50 parts by weight of natural rubber 1.5 phr of vulcanization accelerator (CZ) was combined in a Banbury mixer and released at 160 ° C.

The physical properties of the compounded rubber were measured according to ASTM standards, and the results are shown in Table 1 below.

Comparative Example 2

It was carried out under the same conditions as in Comparative Example 1 except that 4 phr of the antioxidant TMDQ (Polymerized 2,2,4-trimethyl-1,2-dihydroquinoline) was added.

Example 1

Except for adding 2 phr of the antioxidant TMDQ (Polymerized 2,2,4-trimethyl-1,2-dihydroquinoline), the mixture was mixed with the same composition as in Comparative Example 1 and vulcanized under the same conditions. Surface treatment by plasma for 5 seconds. The plasma discharge used a frequency in the range of 20 kHz while mixing air and argon gas at a flow rate of 5 l / min.

As a result, as shown in Table 1, ozone resistance of the plasma sidewall treated with plasma was improved. In addition, the appearance quality of the tire was improved due to the use of less anti-aging agents.

<Table 1> Measurement results of the rubber properties of the comparative examples and examples

Comparative Example 1 Comparative Example 2 Example 1  Basic Properties -.Hardness (shore A)-Tensile Strength -.Elongation Rate  55 165 530  56 170 525  55 167 530  Ozone properties

As described above, in the present invention, the surface of the tire sidewall is plasma-processed using a plasma apparatus to improve surface ozone resistance by improving surface ozone crack resistance and improving the ozone resistance. It can improve the appearance quality. It is also possible to manufacture economical and environmentally friendly tires.

Claims (2)

Tire which plasma-treated the surface of tire sidewall. The tire according to claim 1, wherein the plasma treatment uses atmospheric pressure and a low temperature plasma apparatus.

Images