Method for producing vulcanized rubber composition, vulcanized rubber composition, and studless tire using same

Abstract

This method for producing a vulcanized rubber composition comprises (a) a step for preparing a master batch including a butadiene rubber and silica, (b) a step for preparing a master batch including an isoprene-based rubber and silica, (c) a step for kneading the master batch of (a) and the master batch of (b), and (d) a step for vulcanizing the kneaded product obtained in (c), wherein: the obtained vulcanized rubber composition has a BR phase and an IR phase that are incompatible with one another, and includes a predetermined amount of a terpene-based resin; the abundance ratio alpha of silica in a predetermined BR phase is 0.3 <= alpha <= 0.7 (formula 1); and the proportion beta of the butadiene rubber is 0.4 <= beta <= 0.8 (formula 2). Accordingly, this method can improve on-ice performance, wet performance, and wear resistance in a balanced manner, and can provide: a vulcanized rubber composition that has excellent on-ice performance, wet performance, and wear resistance; and a studless tire using said vulcanized rubber composition as a constituent of a tread.

Description

Technical field

[0001] The invention relates to a preparation method of a vulcanized rubber composition, a vulcanized rubber composition and a studless anti-skid tire made of the vulcanized rubber composition. Background technique

[0002] In order to run on icy and snowy roads, studded tires and chains fitted to the tires have been used so far, and in order to cope with environmental problems such as the resulting dust problem, studless tires have been developed. In order to improve the low-temperature characteristics of studless tires, various improvements have been made from the viewpoints of materials and design. For example, rubber compositions or the like prepared by mixing a large amount of mineral oil into diene rubber with excellent low-temperature properties have been used. However, generally as the amount of mineral oil increases, the abrasion resistance decreases.

[0003] On snow-covered roads, compared with normal roads, the coefficient of friction of tires is signi...

Examples

preparation example Construction

[0065] The method for preparing a vulcanized rubber composition as an embodiment of the present invention includes: step (a): preparing a masterbatch containing butadiene rubber (BR) and silica (BR masterbatch), step (b): preparing a masterbatch containing A master batch of isoprene rubber (IR) and silica (IR master batch), step (c): mixing the BR master batch obtained in step (a) with the IR master batch obtained in step (b) , And step (d): vulcanize the mixture obtained in step (c), and the prepared vulcanized rubber composition has predetermined properties. As described above, by mixing the master batches prepared by mixing each rubber component with silica, the silica that is easily localized in the isoprene rubber can also be localized in the butadiene rubber. In olefin rubber, a vulcanized rubber composition can be easily prepared, which satisfies the predetermined abundance ratio α of silica in the BR phase and satisfies the predetermined ratio β of butadiene rubber, so ...

Embodiment 1～8 and comparative example 1～6

[0156] According to the formula shown in step (I) of Table 1-3, using a 1.7-liter Banbury internal mixer, at a mixing temperature of 150°C when discharged from the internal mixer, the rubber component, silica and The other materials were kneaded for 3 minutes to obtain each mixture containing butadiene rubber and silica (BR master batch) and a mixture containing isoprene rubber and silica (IR master batch). Next, the two mixtures obtained and other materials according to the formula shown in step (II) of Table 1-3 were mixed at a mixing temperature of 150°C for 2 minutes when discharged from the internal mixer to obtain Mixture. According to the formula shown in step (III) of Table 1-3, sulfur and a vulcanization accelerator were added to the obtained kneaded mixture, followed by kneading at a temperature of 150° C. for 5 minutes using an open roll, to obtain an unvulcanized rubber composition. In the case where the compounding amount is not described in step (I) of Table 1-3,...

Technical field

[0001] The invention relates to a preparation method of a vulcanized rubber composition, a vulcanized rubber composition and a studless anti-skid tire made of the vulcanized rubber composition. Background technique

[0002] In order to run on icy and snowy roads, studded tires and chains fitted to the tires have been used so far, and in order to cope with environmental problems such as the resulting dust problem, studless tires have been developed. In order to improve the low-temperature characteristics of studless tires, various improvements have been made from the viewpoints of materials and design. For example, rubber compositions or the like prepared by mixing a large amount of mineral oil into diene rubber with excellent low-temperature properties have been used. However, generally as the amount of mineral oil increases, the abrasion resistance decreases.

[0003] On snow-covered roads, compared with normal roads, the coefficient of friction of tires is signi...

Examples

preparation example Construction

[0065] The method for preparing a vulcanized rubber composition as an embodiment of the present invention includes: step (a): preparing a masterbatch containing butadiene rubber (BR) and silica (BR masterbatch), step (b): preparing a masterbatch containing A master batch of isoprene rubber (IR) and silica (IR master batch), step (c): mixing the BR master batch obtained in step (a) with the IR master batch obtained in step (b) , And step (d): vulcanize the mixture obtained in step (c), and the prepared vulcanized rubber composition has predetermined properties. As described above, by mixing the master batches prepared by mixing each rubber component with silica, the silica that is easily localized in the isoprene rubber can also be localized in the butadiene rubber. In olefin rubber, a vulcanized rubber composition can be easily prepared, which satisfies the predetermined abundance ratio α of silica in the BR phase and satisfies the predetermined ratio β of butadiene rubber, so ...

Embodiment 1～8 and comparative example 1～6

[0156] According to the formula shown in step (I) of Table 1-3, using a 1.7-liter Banbury internal mixer, at a mixing temperature of 150°C when discharged from the internal mixer, the rubber component, silica and The other materials were kneaded for 3 minutes to obtain each mixture containing butadiene rubber and silica (BR master batch) and a mixture containing isoprene rubber and silica (IR master batch). Next, the two mixtures obtained and other materials according to the formula shown in step (II) of Table 1-3 were mixed at a mixing temperature of 150°C for 2 minutes when discharged from the internal mixer to obtain Mixture. According to the formula shown in step (III) of Table 1-3, sulfur and a vulcanization accelerator were added to the obtained kneaded mixture, followed by kneading at a temperature of 150° C. for 5 minutes using an open roll, to obtain an unvulcanized rubber composition. In the case where the compounding amount is not described in step (I) of Table 1-3,...

Images