KR20060119131A - Inner liner rubber composition for truck, bus radial tires - Google Patents

Abstract

Provided is a rubber composition for inner liner of radial pneumatic tire for truck or bus which overcomes an air-indraft problem of inner liner part occurring during manufacturing process and has improved anti-air permeation and anti-cracking properties of inner liner part. The rubber composition for inner liner of radial pneumatic tire for truck or bus comprises a raw rubber comprising 70-95 parts by weight of halogenated isobutylene-isoprene rubber and 5-30 parts by weight of natural rubber, and a butyl tube reclaimed rubber as filler. The amount of the natural rubber is 5-50 parts by weight based on 100 parts by weight of the raw rubber. The butyl tube reclaimed rubber comprises 30-70 wt% of isobutylene-isoprene rubber and 20-50 wt% of carbon black.

Description

Inner liner Rubber Composition for Truck, Bus Radial Tires}

The present invention relates to a radial pneumatic tire inner liner rubber composition for trucks and buses, and more particularly, by adding butyl tube recycled rubber as a filler to a hybrid rubber of halogenated butyl rubber and natural rubber having excellent air permeability. Radial pneumatic tire inner liner rubber composition for trucks and buses to improve the air permeability and fatigue resistance by solving the process problems caused by the inner liner air inlet formed during the molding process of the liner.

Recently, due to the high performance of trucks and buses and the development of expressways, related vehicles not only maintain significant high-speed driving performance, but also the severity applied to truck and bus radial tires is gradually increased due to the increase in loading weight due to improved vehicle performance. It is a situation. Therefore, tire makers are making a lot of efforts to improve the air permeability and fatigue performance of the inner liner unit in order to maintain excellent long-distance driving performance even in such harsh conditions.

Conventionally, by using halogenated butyl rubber or mixed rubber of halogenated butyl rubber and natural rubber for the purpose of improving air permeability of truck and bus radial tires, it is possible to minimize the occurrence of the inner liner part in the molding process. The method of maintaining air permeability was used.

However, due to the improved performance of trucks and buses, high-speed driving performance and long-term driving durability are required. Accordingly, there are certain limitations to meet the performance requirements of truck and bus radial tires.

In addition, when the halogenated butyl rubber is increased to improve air permeability of truck and bus radial tires, the occurrence of inner line air in the molding process is significantly increased, which may cause serious process problems. Can be used.

In order to improve the air permeability of an inner liner rubber composition, development of various rubber compositions is performed. For example, Korean Patent Laid-Open Publication No. 2003-0030645 discloses that the inner liner rubber composition is 70 to 90 parts by weight of butyl halide rubber and 10 to 30 parts by weight of epoxidized natural rubber to improve adhesion to adjacent rubber and air permeability. The rubber composition has been remarkably improved, and in the Republic of Korea Patent Publication No. 2002-0042232, carbon black is 60 to 100 based on 100 parts by weight of the raw material rubber for the purpose of improving the air resistance and crack resistance of the inner liner rubber. A rubber composition containing parts by weight has been developed.

As such, the performance demand characteristics of truck and bus radial tires are gradually increasing. Accordingly, in order to overcome this problem, tire manufacturers increase the amount of halogenated butyl rubber to improve air permeability. Since the halogenated butyl rubber can be used only by overcoming the problem of the innerliner air bleeding that may occur during the process, it is a reality that various difficult problems must be solved in order to apply the halogenated butyl rubber.

The present invention is to improve the above problems, an object of the present invention is to solve the problem of the air inlet liner portion that may occur during the manufacturing process, while improving the air permeability and crack resistance characteristics of the inner liner portion truck, bus A radial pneumatic tire inner liner portion rubber composition is provided.

Radial pneumatic tire inner liner rubber composition for trucks and buses of the present invention contains 5 to 50 parts by weight of butyl tube recycled rubber having a function as a filler in 70 to 95 parts by weight of butyl halide rubber and 5 to 30 parts by weight of natural rubber. Characterized in that made.

In the butyl tube recycled rubber used in the present invention, the general butyl rubber content is preferably 30 to 70% by weight, and the carbon black content is 20 to 50% by weight.

The butyl tube reclaimed rubber is recovered by collecting the butyl tube for trucks and buses, and then performing a screening test (removal of foreign substances and valves), followed by washing and screening of other metal materials, crushing and washing, and then storing at 200 ° C. or higher. And is subjected to DEVULCANIZATION at pressure and kneaded, then extruded through an extruder, cut to a certain weight, matured and cooled.

In the present invention, if the content of the butyl tube recycled rubber is less than 5 parts by weight, the effect of the addition of the butyl tube recycled rubber is insufficient, and if it exceeds 50 parts by weight may adversely affect the physical properties of the rubber composition is not preferred.

In the rubber composition of the present invention, additives for conventional rubber compositions, such as fillers, crosslinking agents, accelerators, activators, emulsifiers and the like, may be appropriately selected and added, and the selection and the use amount of such additives are known in the art.

The present invention can be understood in more detail by the following examples and comparative examples, the following examples are only for illustrating the present invention, and are not intended to limit the protection scope of the present invention.

EXAMPLE

To prepare a specimen with a rubber composition prepared using BTRR (butyl tube recycled rubber) having the composition of Table 1, and then measured the physical properties of the vulcanized rubber and vulcanized rubber of the rubber composition according to the ASTM standard, The results are shown in Table 2.

Comparative Example 1

60 parts by weight of carbon black, 10 parts by weight of process oil, 3 parts by weight of zinc oxide, 2 parts by weight of stearic acid, sulfur with respect to 100 parts by weight of the raw material rubber composed of 100 parts by weight of halogenated butyl rubber (HIIR) at the compounding ratio shown in Table 2 below. 1 weight part and 1 weight part of vulcanization accelerators were added, it mix | blended with the half-barrier mixer, and it discharge | released at the temperature of 105 degreeC.

Comparative Example 2

60 parts by weight of carbon black, 10 parts by weight of process oil, and 3 parts by weight of zinc oxide based on 100 parts by weight of the raw material rubber composed of 90 parts by weight of halogenated butyl rubber (HIIR) and 10 parts by weight of natural rubber at the compounding ratio shown in Table 2 below. , 2 parts by weight of stearic acid, 1 part by weight of sulfur, and 1 part by weight of a vulcanization accelerator were added, blended into a half-barrier mixer, and released at a temperature of 105 ° C.

Example 1

In the blending ratio shown in Table 2, 5 parts by weight of butyl tube regenerated rubber (BTRR) was added to 90 parts by weight of halogenated butyl rubber (HIIR) and 100 parts by weight of raw rubber of 10 parts by weight of natural rubber, and 60 parts by weight of carbon black. 10 parts by weight of oil, 3 parts by weight of zinc oxide, 2 parts by weight of stearic acid, 1 part by weight of sulfur, and 1 part by weight of vulcanization accelerator were added, blended in a half-barrier mixer, and discharged at a temperature of 105 ° C.

Example 2

In the compounding ratio shown in Table 2, 10 parts by weight of butyl tube regenerated rubber (BTRR) was added to 90 parts by weight of halogenated butyl rubber (HIIR) and 100 parts by weight of raw rubber of natural rubber, and 60 parts by weight of carbon black. 10 parts by weight of oil, 3 parts by weight of zinc oxide, 2 parts by weight of stearic acid, 1 part by weight of sulfur, and 1 part by weight of vulcanization accelerator were added, blended into a half-barrier mixer, and discharged at a temperature of 105 ° C.

Example 3

In the compounding ratio shown in Table 2, 20 parts by weight of butyl tube regenerated rubber (BTRR) was added to 90 parts by weight of halogenated butyl rubber (HIIR) and 100 parts by weight of raw rubber of 10 parts by weight of natural rubber, and 60 parts by weight of carbon black. 10 parts by weight of oil, 3 parts by weight of zinc oxide, 2 parts by weight of stearic acid, 1 part by weight of sulfur, and 1 part by weight of vulcanization accelerator were added, blended in a half-barrier mixer, and discharged at a temperature of 105 ° C.

Example 4

To the compounding ratio shown in Table 2, 50 parts by weight of butyl tube recycled rubber (BTRR) was added to 90 parts by weight of halogenated butyl rubber (HIIR) and 100 parts by weight of raw rubber of 10 parts by weight of natural rubber, and 60 parts by weight of carbon black. 10 parts by weight of oil, 3 parts by weight of zinc oxide, 2 parts by weight of stearic acid, 1 part by weight of sulfur, and 1 part by weight of vulcanization accelerator were added, blended into a half-barrier mixer, and discharged at a temperature of 105 ° C.

Furtherance ratio Butyl rubber 50 wt% Carbon black 38% by weight Plasticizer 12 wt%

According to the above results, the rubber composition for the radial tire inner liner for trucks and buses according to the present invention was found to be used as a result of Examples 1 to 4, in which halogenated butyl rubber and natural rubber were used in combination (Comparative Example 2). In comparison with the above, it can be seen that the gas permeability characteristics were remarkably improved when BTRR was added, and that the innerliner air particle generation index was also remarkably improved as compared with the case of applying butyl rubber alone (Comparative Example 1). Could get

As can be seen from the above, the radial pneumatic tire inner liner rubber composition for trucks and buses of the present invention not only improves the air permeability of the inner liner by adding butyl tube recycled rubber, but can also be generated in the molding process. At the same time, the process quality problems caused by the occurrence of inner liner air inlet can be significantly reduced.

Claims (2)

Radial pneumatics for trucks and buses comprising 5 to 50 parts by weight of butyl tube recycled rubber relative to 100 parts by weight of raw material rubber including 70 to 95 parts by weight of halogenated butyl rubber and 5 to 30 parts by weight of natural rubber. Tire inner liner rubber composition. The rubber composition of claim 1, wherein the butyl tube recycled rubber contains 30 to 70 wt% of general butyl rubber and 20 to 50 wt% of carbon black.