Rubber composition, preparation method thereof and run-flat tire inner support

A technology for run-flat tires and rubber compositions, applied in the fields of rubber compositions and tire rubber compositions, can solve the problem of low hysteresis and processability, heat resistance, low hysteresis loss, and inability to take into account the resistance to low hysteresis. Heat resistance and other problems, to achieve the effect of low mechanical strength, low hysteresis, excellent heat resistance

Active Publication Date: 2021-12-03
QINGDAO DOUBLESTAR TIRE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the main problem to be solved by the present invention is to overcome the fact that the existing run-flat tire inner support rubber composition is mainly made of natural rubber and butadiene rubber, which cannot take into account heat resistance and high mechanical strength. And the technical problem of low hysteresis, a kind of extremely excellent heat resistance, mechanical strength and low hysteresis loss is proposed, without losing its flex resistance, low hysteresis and processability, zero pressure durability can reach Rubber composition of more than 2.5 hours, its preparation method and run-flat tire inner support

Method used

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  • Rubber composition, preparation method thereof and run-flat tire inner support
  • Rubber composition, preparation method thereof and run-flat tire inner support

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preparation example Construction

[0037] Another aspect of the present invention provides a method for preparing the rubber composition according to any of the above technical solutions, comprising the following steps:

[0038] One-stage mixing: add the low-cis-polybutadiene rubber, high-dispersion white carbon black, silane coupling agent and 1 / 2 carbon black into the closed rubber mixer according to the ratio of parts by weight, and mix Evenly discharge the glue to get a piece of masterbatch;

[0039] Two-stage mixing: according to the ratio of parts by weight, the hydrogenated modified block-type integrated rubber is added to the closed rubber mixer and masticated, and then the one-stage masterbatch, filler dispersant, anti-aging agent, activation agent and the remaining 1 / 2 of carbon black, after mixing evenly, discharge the glue to obtain the second-stage masterbatch;

[0040] Three-stage mixing: Add the two-stage masterbatch, insoluble sulfur, accelerator and anti-reversion agent into a closed rubber mi...

Embodiment 1

[0045] This embodiment provides a high heat-resistant run-flat tire inner support rubber composition and a preparation method thereof, specifically:

[0046] The inner support rubber composition formula, in parts by weight, includes the following components:

[0047] Hydrogenated modified block type integrated rubber 60 parts, low cis polybutadiene rubber 40 parts, N550 carbon black 35 parts, 1115MP white carbon black 20 parts, TESPT silane coupling agent 2.4 parts, SL5050 filler dispersant 2 parts , 3.5 parts of anti-aging agent, 5 parts of activator, 1.6 parts of insoluble sulfur, 1.5 parts of NS accelerator, 1 part of TBzTD anti-reversion agent.

[0048] Among them, the weight-average molecular weight of hydrogenated modified block-type integrated rubber is 650,000, and the hydrogenation degree of double bonds is 92%. The integrated rubber before hydrogenation has a linear tri-block structure: both ends are randomly copolymerized styrene-butadiene rubber segments, It accou...

Embodiment 2

[0059] This embodiment provides a high heat-resistant run-flat tire inner support rubber composition and a preparation method thereof, specifically:

[0060] The inner support rubber composition formula, in parts by weight, includes the following components:

[0061] 60 parts of hydrogenated modified block-type integrated rubber, 40 parts of low-cis polybutadiene rubber, 25 parts of BC2123 carbon black, 25 parts of 1085MP white carbon black, 2 parts of NXT silane coupling agent, AEO-9 filler dispersant 2 parts, 3.5 parts of anti-aging agent, 5 parts of activator, 1.6 parts of insoluble sulfur, 1.5 parts of NS accelerator, 1 part of WY9188 anti-reversion agent.

[0062] Among them, the molecular structures of hydrogenated modified block-type integrated rubber and low-cis polybutadiene rubber are the same as those in Example 1.

[0063] The preparation method is the same as in Example 1.

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Abstract

The invention discloses a rubber composition, a preparation method thereof and a run-flat tire inner support, and belongs to the field of tire rubber compositions. The rubber composition comprises the following components in parts by weight: 50-70 parts of integrated rubber and 30-50 parts of low cis-polybutadiene rubber, the integrated rubber is hydrogenated modified block type integrated rubber, the weight-average molecular weight of the hydrogenated modified block type integrated rubber is 300,000-800,000, the total hydrogenation degree of double bonds is 80%-95%, and the integrated rubber before hydrogenation modification is integrated rubber of a linear three-block structure. The rubber composition is applied to the aspect of run-flat tires, solves the technical problem that the existing run-flat tire inner support rubber composition is mainly composed of natural rubber and butadiene rubber and cannot give consideration to heat resistance, high mechanical strength and low hysteresis quality, and has excellent heat resistance, mechanical strength and low hysteresis loss; and the characteristics of flexing resistance, low hysteresis quality, machinability and zero-air-pressure durability which can reach more than 2.5 hours are not lost.

Description

technical field [0001] The invention belongs to the technical field of tire rubber compositions, and in particular relates to a rubber composition, a preparation method thereof and a run-flat tire inner support. Background technique [0002] Run-flat tires refer to tires that have a certain ability to continue driving under the condition of tire damage and loss of air pressure. According to the laws and regulations of our country, run-flat tires can be driven at 80km / h for more than 1h at least under zero pressure conditions. Existing run-flat tires mainly add high-hardness supporting rubber on the inner side of the soft sidewall of the tire, thereby reducing the deformation of the tire after decompression and maintaining a certain stable driving ability. After the run-flat tire loses pressure, most of the vehicle load is borne by the inner support rubber, which requires the support rubber not only to have a higher hardness (generally Shore A hardness 70-80), but also to ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L53/02C08L11/00C08K3/04C08K7/26B60C17/04
CPCC08L53/025C08L9/00B60C17/04C08L2201/08C08K3/04C08K7/26Y02T10/86
Inventor 张静黄义钢王君孙钲王子琪孙超苏明
Owner QINGDAO DOUBLESTAR TIRE IND CO LTD
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