A low 6PPD tire sidewall rubber composition for electric vehicles and its preparation method

CN122302390APending Publication Date: 2026-06-30PRINX CHENGSHAN (SHANDONG) TIRE COMPANY LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PRINX CHENGSHAN (SHANDONG) TIRE COMPANY LTD
Filing Date
2026-05-14
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Traditional tire sidewall rubber relies on a large amount of 6PPD antioxidant, which leads to environmental pollution. Furthermore, when EPDM and CR are blended at high temperatures, poor dispersion and mismatch in vulcanization result in decreased performance and an inability to meet the high durability requirements of electric vehicles.

Method used

The tire sidewall rubber composition for electric vehicles with a low 6PPD content is used. EPDM, NR/BR and CR are mixed separately through a three-stage masterbatch method, combined with highly dispersed silica, protective wax and other antioxidants to form a uniform interpenetrating network, and then co-cured at low temperature.

Benefits of technology

It achieves low environmental risk, excellent ozone aging resistance, improved flexural fatigue life and low rolling resistance, solves the process bottleneck of EPDM and CR blending, and meets the high durability requirements of electric vehicles.

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Abstract

This invention provides a low-6PPD sidewall rubber composition for electric vehicle tires, comprising the following components per 100 parts by weight of raw rubber: 30-50 parts natural rubber; 30-60 parts butadiene rubber; 10-25 parts EPDM rubber; 0-15 parts chloroprene rubber; 35-60 parts carbon black; 0-15 parts highly dispersed silica; 0-1.5 parts antioxidant (6PPD); 3-5 parts other antioxidants; and 1-4 parts protective wax. This invention constructs an intrinsically ozone-resistant system through a scientifically proportioned ratio of EPDM, CR, and NR / BR. It creatively employs a "three-stage masterbatch method" mixing process, using process isolation to allow EPDM, CR, and NR / BR to complete filler mixing and structural construction under optimal process windows. Finally, blending and co-vulcanization are achieved at low temperatures, thus achieving a breakthrough in comprehensive performance with extremely low 6PPD content.
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