High-flexural-fatigue-life aviation sidewall rubber as well as preparation method and application thereof

Abstract

The invention relates to a formula of high-flexural-fatigue-life aviation sidewall rubber and particularly relates to application and a preparation method of aviation tire sidewall rubber containing trans-1,4-butadiene-isoprene copolymer rubber. The sidewall rubber contains the following substances in parts by weight: 5-30 parts of trans-1,4-butadiene-isoprene copolymer rubber TBIR, 50-85 parts ofnatural rubber NR, 10-20 parts of butadiene rubber BR, 0-80 parts of carbon black, 0-30 parts of silicon dioxide, 0-5 parts of a silane coupling agent Si690, 0-10 parts of a plasticizer, 0-0.8 part of a scorch retarder, 0.5-3 parts of sulfur, 0.3-5 parts of an accelerant and other aids. The sidewall rubber is prepared by virtue of a three-section banburying and open milling process. The Green strength of the mixed sidewall rubber is more than 3MPa, vulcanized rubber has the stress at definite elongation of 300% of over 18MPa, and the flexure-resistance 6-level cracking number of times is over80000.

Description

technical field [0001] The invention belongs to the technical field of rubber, and in particular relates to an aviation sidewall rubber with high flex fatigue life, its preparation method and application. Background technique [0002] The sidewall rubber is the part of the tire that undergoes extremely frequent flexing and deformation, and should have excellent flex cracking resistance. When aviation tires are used, the tread is easy to wear after many take-offs and landings, and the usual way to deal with it is to retread. During retreading, when the newly bonded tread rubber undergoes the vulcanization process, the original sidewall rubber will be subjected to high temperature and high pressure again, which is prone to aging. Therefore, the sidewall rubber should have good aging resistance and vulcanization flatness. Retreading tires is a huge test for sidewall rubber, requiring that the sidewall rubber maintain its performance after multiple vulcanizations. [0003] At...

AI Technical Summary

Problems solved by technology

[0003] At present, the sidewall rubber system of aviation tires is mostly natural rubber or a combination system of natural rubber and butadiene rubber or styrene-butadiene rubber, adding high-structure and high-wear-resistant N339 carbon black, paraffin wax, protective wax RP-3, and p-phenylenediamine anti-aging Agent, sulfur, sulfenamide accelerator DZ and other ingredients, but there are problems such as poor resistance to solar radiation aging and cracking resistance

Chinese invention patent application CN 104844850 A discloses a method of improving the solar radiation resistance of aviation sidewall rubber by adding ultraviolet absorbers and crack preventers, but butadiene rubber has disadvantages such as poor processability, low strength, and poor aging resistance. Requires a lot of carbon black reinforcement

Chinese invention patent CN 106496657A discloses an aviation sidewall rubber using Eucommia gum. Compared with BR, Eucommia gum is easy to crystallize, and after blending with NR, the tearing, aging, and fatigue properties are improved, and the flex resistance is improved. But its modulus is low, especially 300% modulus is only about 13MPa

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