KR100529247B1 - A reclaimed rubber composition of truck-tire - Google Patents

Abstract

The present invention relates to a truck tire rubber composition for regeneration, and more particularly, to an antireversion agent composed of 1,6-bis N, N-dibenzenylthiocarbamoyldiso-hexane in a reclaimed rubber composition for truck tires. By adding the same amount of anti-reversion agent as the amount of vulcanizing agent, it improves the resistance characteristics to the reversion phenomenon of natural rubber used as raw material rubber, reinforces the exothermic performance of manufactured tires, and decreases the physical properties due to tire aging. The present invention relates to a truck tire rubber composition for recycling.

Description

A reclaimed rubber composition of truck-tire}

The present invention relates to a truck tire rubber composition for regeneration, and more particularly to 1,6-bis N, N-dibenzenylthiocarbamoyldiso-hexane ('1) in an amount equal to the amount of vulcanizing agent added to the rubber composition. The present invention relates to a recyclable truck tire rubber composition capable of preventing reversion of natural rubber and preventing physical degradation due to aging by adding, 6-bis (N, N'-dibenzenylthiocarbamoylditho) -hexane.

In general, truck tires directly friction the road surface, so it is common to replace only the tread area.

The recycled rubber for trucks used in this way is used as a raw material rubber in combination with natural rubber and a small amount of synthetic rubber.In order to prevent aging characteristics, it is necessary to adjust the content of vulcanizing agent and accelerator or to adjust the content of carbon black. It is common to optimize

However, in the case of the recycled rubber for trucks, natural rubber is mainly used as a raw material rubber like a general new tire, and thus has a disadvantage in that the initial physical properties rapidly decrease as the service life increases.

Sulfur, which is used as a vulcanizing agent of rubber, acts as a link between rubber molecules and rubber molecules in the middle of the initial physical properties, and heat is generated due to excessive load and increase in use time. This causes polysulfide crosslinks to boil into mono or di sulfide bonds or form cyclic molecular structures.

In this way, the polysulfide structure is changed into mono, die, cyclic sulfide, conjugated diene and triene by thermal decomposition reaction, and the property change due to the decrease in the crosslinking density and polysulfide concentration. It's called (reversion).

As the main physical property change caused by such a reversion phenomenon, physical properties such as tensile strength and fatigue resistance change as the polysulfide crosslinking concentration decreases.

Therefore, in the rubber composition using natural rubber, heat generation is a serious problem because it causes the aging characteristics according to the reversion phenomenon, in particular, the recycled rubber for the tread of the truck compared to the rubber composition used for general tires More resistance characteristics are required.

Conventionally, in order to minimize the above-mentioned reversion phenomenon, an appropriate filler is added, a polymer having a low unsaturation of the main chain, or a polymer having a high trans content is used.

However, the above methods have a problem in that the recycled tires for trucks, which generate greater loads and higher heat than the general tires, are inadequately used because they have insufficient protection against the reversion phenomenon.

Therefore, the present invention is configured to solve the above problems, by improving the resistance characteristics against the reversion phenomenon of the natural rubber used as the raw material of the recycled rubber for truck tires by reinforcing the heat generation performance of the tire produced by aging It is an object of the present invention to provide a recyclable truck tire rubber composition capable of preventing a drop in physical properties.

The present invention to achieve the above object,

In the truck tire rubber composition for regeneration comprising natural rubber as raw material rubber,

Anti-consisting of 1,6-bis N, N-dibenzenylthiocarbamoyldiso-hexane (1,6-bis (N, N'-dibenzenylthiocarbamoylditho) -hexane) in an amount equal to the amount of vulcanizing agent added to the rubber composition It can be achieved by providing a recyclable truck tire rubber composition characterized by the addition of an anti-reversion agent.

Hereinafter will be described in more detail with respect to the recycled truck tire rubber composition of the present invention.

In the present invention, 1,6-bis N, N is used in a recyclable truck tire rubber composition composed of carbon black, zinc oxide, stearic acid, process oils, accelerators, and sulfur vulcanizers, using natural rubber as a raw material rubber. The anti-reversion agent consisting of dibenzenylthiocarbamoyldiso-hexane is added in an amount equal to the amount of sulfur added to suppress the reversion of natural rubber and to prevent degradation of physical properties due to aging.

1,6-bis N, N-dibenzenylthiocarbamoyldiso-hexane, which is used as the antireversion agent used as described above, can be easily purchased under the trade name of Vulcuren VP KA9188, and has the characteristics shown in Table 1 below.

product name  Vulcuren VP KA9188 shape  White or pale yellow, oil coated powder Specific gravity (g / cm 3)  1.25 Melting Point (℃)  92 content(%)  95 Oil content (%)  5 (Mineral oil) Configuration  1,6-bis (N, N'-dibenzenylthiocarbamoylditho) -hexane

When the anti-reversion agent having the above characteristics is added to the rubber composition, the sulfide bonds formed by the conventional vulcanizing agent as shown in the following Chemical Formula 1 are transformed into multiple sulfide bonds as shown in the following Chemical Formula 2, and such multiple sulfide bonds. Can be converted to mono, di or up to three sulfide bonds to increase the bonding force between the rubber and the rubber chain to prevent reversion.

Rubber-S _y -Rubber (y = 4 or more)

Rubber-S _x- (CH ₂ ) ₆ -S _x -Rubber (x = 3 or less)

It was found experimentally that the anti-reversion agent is most effective in the resistance to the reversion phenomenon when the same amount of the vulcanizing agent used in the rubber composition is added.

Resistance to the reversion of natural rubber used as raw material rubber by adding anti-reversion agent composed of 1,6-bis N, N-dibenzenylthiocarbamoyldiso-hexane to recycled rubber composition for truck tires as described above It is possible to reinforce the exothermic performance of the tire produced by improving the characteristics, and to prevent the physical property degradation due to tire aging.

Although the present invention will be described in more detail with reference to the following examples, the following examples are merely illustrative of the present invention, and the present invention is not limited by the following examples.

Comparative Example

Recycled rubber for truck tires manufactured by mixing 100 g of natural rubber used as raw material rubber, 50 g of carbon black (N220), 5 g of zinc oxide, 2 g of stearic acid, 6 g of process oil, 1 g of wax, 2 g of vulcanizing agent (S), and 1 g of accelerator. A composition was made into the comparative example

<Example 1>

A recycled rubber composition for truck tires prepared in the same manner as in Comparative Example, but prepared by adding 1 g of an antireversion agent consisting of 1,6-bis N, N-dibenzenylthiocarbamoyldiso-hexane to Example 1 It was.

<Example 2>

A recycled rubber composition for truck tires prepared in the same manner as in Comparative Example, but prepared by adding 2 g of an anti-reversion agent composed of 1,6-bis N, N-dibenzenylthiocarbamoyldiso-hexane to Example 2 It was.

Experimental Example

Tensile strength and aging tensile strength of the recycled rubber composition prepared as in Comparative Examples and Examples 1 to 2 were measured by measuring the physical properties by the tensile property test method specified in KS M6518, and the tensile strength drop rate was measured. The maximum torque was measured at 145 ° by using the device, and after 10 minutes, the torque was again measured, and the reduction ratio thereof was measured numerically. The results are shown in Table 2 below.

Comparative example Example 1 Example 2 Initial tensile strength (㎏ / ㎠) 275 285 305 Aging Tensile Strength (㎏ / ㎠) 245 269 295 Tensile strength drop rate (%) 10.9 5.6 3.3 maximum torque 35 36 38 torque after 10min 28 33 37 reversion (%) 20 9.1 2.6

As can be seen from Table 2, Examples 1 to 1 wherein the anti-reversion agent is added compared to the comparative example without the addition of the anti-reversion agent consisting of 1,6-bis N, N-dibenzenylthiocarbamoyldiso-hexane In the case of 2, it can be seen that the decrease rate and the reversion of tensile strength are low, and in particular, Example 2 having the same amount of sulfur as the reversion agent is lower than that of Example 1 in which only half is added compared to sulfur. It shows that the version phenomenon is improved.

As described above, the present invention relates to an anti-reversion agent composed of 1,6-bis N, N-dibenzenylthiocarbamoyldiso-hexane in the recycled rubber composition for truck tires. By adding the amount, the resistance to the reversion phenomenon of the natural rubber used as the raw material rubber is improved, thereby reinforcing the exothermic performance of the manufactured tire and preventing the physical property deterioration due to tire aging.

Claims (1)

In the truck tire rubber composition for regeneration comprising natural rubber as raw material rubber, Anti-consisting of 1,6-bis N, N-dibenzenylthiocarbamoyldiso-hexane (1,6-bis (N, N'-dibenzenylthiocarbamoylditho) -hexane) in an amount equal to the amount of vulcanizing agent added to the rubber composition Recycling truck tire rubber composition characterized by the addition of an anti-reversion agent