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Production method of vulcanized rubber composition, vulcanized rubber composition, and studless tire using the same

A vulcanized rubber and composition technology, which is applied in special tires, tire parts, transportation and packaging, etc., can solve the problems of increased hardness difference, decreased rubber strength and wear resistance, and achieves excellent performance

Active Publication Date: 2021-04-13
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the filler is localized, its tendency is enhanced, and as a result, the difference in hardness from the rubber component of the continuous phase increases, which easily causes a decrease in rubber strength and wear resistance
Natural rubber tends to have greater hardness than butadiene rubber even when it is used alone, so further increase in hardness difference due to localization of silica is not expected

Method used

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  • Production method of vulcanized rubber composition, vulcanized rubber composition, and studless tire using the same
  • Production method of vulcanized rubber composition, vulcanized rubber composition, and studless tire using the same
  • Production method of vulcanized rubber composition, vulcanized rubber composition, and studless tire using the same

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preparation example Construction

[0062] As an embodiment of the present invention, the preparation method of the vulcanized rubber composition comprises: (a) the step of preparing a masterbatch (BR masterbatch) comprising butadiene rubber (BR) and silica; (b) preparing a step of preparing A step of masterbatch (IR masterbatch) of diene rubber (IR) and silica; (c) kneading the BR masterbatch obtained in step (a) with the IR masterbatch obtained in step (b) step; and (d) a step of vulcanizing the kneaded product obtained in step (c), and the obtained vulcanized rubber composition has predetermined properties. As mentioned above, by kneading the masterbatch prepared by kneading each rubber component separately with silica, silica which is easy to localize in isoprene rubber such as natural rubber can also be kneaded in butadiene rubber localization, it is possible to easily prepare a vulcanized rubber composition that satisfies the specified abundance ratio α of silica in the BR phase and satisfies the specified...

Embodiment 1～10 and comparative example 1～5

[0144] According to the formula shown in step (I) of Table 1 or 2, using a 1.7L Banbury mixer, the rubber component, silicon dioxide and other The materials were kneaded for 3 minutes to obtain a kneaded product (BR master batch) containing butadiene rubber and silica, and a kneaded product (IR master batch) containing isoprene rubber and silica, respectively. Next, the obtained kneaded product and other materials according to the formula shown in the step (II) of Table 1 or 2 are mixed for 5 minutes at a mixing temperature of 150° C. when discharged from the internal mixer, so that to obtain a kneaded product. According to the formulation shown in step (III) of Table 1 or 2, sulfur and a vulcanization accelerator were added to the obtained kneaded product, followed by kneading for 5 minutes at a temperature of 150° C. using an open roll to obtain Unvulcanized rubber composition. In the case where the mixing amount is not described in step (I) of Table 1 or 2, only step (II)...

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Abstract

A method for preparing a vulcanized rubber composition according to the present invention, comprising: (a) a step of preparing a masterbatch containing butadiene rubber and silica, (b) preparing a masterbatch containing isoprene rubber and silica (c) the step of kneading the master batch obtained in (a) and the master batch obtained in (b), and (d) the step of 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 each other, the abundance ratio α of silica in the prescribed BR phase satisfies 0.3≤α≤0.7 (Relational Expression 1), and the butadiene rubber The ratio β satisfies 0.4≤β≤0.8 (Relational Expression 2), which can improve the on-ice performance and wear resistance in a good balance, and can provide a vulcanized rubber composition excellent in on-ice performance and wear resistance, and a vulcanized rubber composition with the A studless tire with a tread made from the same material.

Description

technical field [0001] The invention relates to a preparation method of a vulcanized rubber composition, a vulcanized rubber composition and a studless antiskid tire prepared by using the vulcanized rubber composition. Background technique [0002] In order to travel on ice and snow roads, the use of studded tires and the installation of chains on the tires have hitherto been adopted, and studless tires have been developed in order to cope with environmental problems such as dust problems caused thereby. In order to improve the low-temperature characteristics of studless tires, various improvements have been made from the viewpoint of materials and design points, for example, rubber made by mixing a large amount of mineral oil into diene-based rubber excellent in low-temperature characteristics has been used composition etc. However, generally as the amount of mineral oil increases, the wear resistance will decrease. [0003] On snow-covered roads, compared with normal roa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/22B60C1/00C08K3/36C08L9/00C08L91/00
CPCB60C1/00C08K3/36C08L91/00C08J3/005C08J2307/00C08J2407/00C08L9/00C08J3/226C08J2309/00C08J2409/00C08J3/22B60C1/0016C08J3/24C08L2205/02C08L2310/00
Inventor 竹中美夏子儿岛良治
Owner SUMITOMO RUBBER IND LTD
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