Rubber composition with good color fastness for colored tire sidewalls

Abstract

The invention provides a rubber composition with good color fastness for colored tire sidewalls. The rubber composition comprises the following materials in parts by weight: 100 parts of matrix rubber, 30-40 parts of an active filler, 20-30 parts of a coloring filler, 5-7 parts of paraffin oil, 5-7 parts of an activator, 2-3 parts of a silane coupling agent, 1-2 parts of light-color tackifying resin, 4-6 parts of a non-staining antioxidant, 1-12 parts of a vulcanizer, 3-5 parts of a promoter, 3-6 parts of an organic coloring agent and 1-2 parts of an ultraviolet light absorber. A sidewall prepared from the rubber composition has a bright color and relatively good color fastness; and a tire with a dark-color sidewall is free from discoloring within one year under strong sunlight illumination or in a damp and hot environment, and even a tire with a light-color sidewall is free from obvious discoloring within three months under strong sunlight illumination or in a damp and hot environment. The sidewall prepared from the composition has higher tearing resistance, approximate flexing resistance and aging resistance than a black sidewall. Compared with a general colored sidewall, the sidewall prepared from the composition maintains extremely good color fastness under severe working conditions of strong sunlight illumination, dampness and heat.

Description

Technical field [0001] The invention relates to a rubber composition for automobile tires, in particular to a rubber composition designed for discoloration resistance of the sidewalls of colored tires. Background technique [0002] Traditional tires are all black or a single color, which cannot satisfy users' demands for beauty, and cannot demonstrate user personality. Now some companies have developed colored sidewalls, but these early-stage colored tires all have different degrees of discoloration, especially light colored tires, which are particularly prominent in the early stage of use when they are exposed to sunlight. The color of the tire changes significantly, which affects the appearance of the tire and cannot fully meet the needs of users. [0003] The announcement number is: CN102532619 A "A rubber composition for the sidewall of colored radial truck tires". The sidewall produced by this invention patent is made into a rubber sample, and the discoloration under the sun ...

AI Technical Summary

Problems solved by technology

[0002] Traditional tires are all black or a single color, which cannot meet the user's demand for beauty and cannot show the user's personality

Now some companies have developed colored sidewalls, but these color tires developed in the early stage all have different degrees of discoloration, especially light-colored tires, which are particularly prominent in the early stage of use when exposed to sunlight, and become colorful after discoloration. Th