Low rolling-resistance high abrasion-resistance recap vulcanized tread rubber compound and preparation method thereof

Abstract

The invention relates to a low rolling-resistance high abrasion-resistance recap vulcanized tread rubber compound. The low rolling-resistance high abrasion-resistance recap vulcanized tread rubber compound comprises the following components in parts by weight: 40-60 parts of natural rubber, 40-60 parts of butadiene rubber, 25-32 parts of carbon black, 20-30 parts of white carbon black, 4-6 parts of a silane coupling agent TESPT, 0.1-0.4 parts of an environmentally friendly peptizer, 2-3 parts of stearic acid, 4-6 parts of zinc oxide, 0-2 parts of a carbon black dispersing agent, 0.5-2 parts of an antioxidant RD, 1-3 parts of an antioxidant 4020, 1-2 parts of protection wax, 1-3 parts of sulphur S-80, 1-2.5 parts of a promoter CZ-80, and 0.2-0.4 parts of a scorch retarder CTP-80. A mixing technology of the above rubber compound employs first-stage mixing and primary rubber mixing at low temperature, the produced tread can be used for retreading the tires, compared with conventional retreaded tires, the gasoline consumption during a driving process of the vehicle is reduced by more than 3%, an Akron abrasion index is obviously better than that of the conventional low rolling-resistance load-carrying radial tire tread rubber compound, the total formula cost for recap is reduced.

Description

Technical field [0001] The invention relates to the production of retreaded tire pre-vulcanized treads and the field of tire retreading, in particular to a pre-vulcanized retreaded tread compound formula and a preparation method thereof. Background technique [0002] The U.S. Environmental Protection Agency (EPA) proposed the Smartway certification standard for retreaded tires. According to the EPA's verification of tire retreading technology, retreaded tires with low rolling resistance are used for long-distance transportation Class 8 trucks, which can reduce fuel consumption compared to retreaded products that are widely used. At least 3%. Therefore, reducing the rolling resistance of the tread rubber is of great significance for reducing fuel consumption, reducing automobile exhaust emissions, reducing air pollution, and increasing economic benefits for vehicles that widely use retread tire products. After the United States Environmental Protection Agency (EPA) proposed the S...

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Problems solved by technology

[0004] The formulation technology to reduce rolling resistance has been partially adopted in new tires, see Chinese patent application number: 201310671438.8 [a low rolling resistance all-steel radial tread rubber formula and preparation method], the amount of butadiene rubber in the tread rubber formula Generally, it does not exceed 30 parts, and the amount of white carbon black replacing carbon black is more than 30 parts. Since a large amount of white carbon black is used for reinforcement and a small proportion of butadiene rubber with excellent wear resistance is used in the formula, it is used for long-distance transportation. The wear resistance of truck driven wheels is significantly lower than the service mileage of butadiene rubber tread rubber with carbon black reinforcement and a large proportion of excellent wear resistance. Although the rolling resistance of the tire is reduced and the fuel consumption is reduced, the use of the tire The service life is relatively reduced, which cannot meet the service life requirements of the driven wheels of long-distance transport trucks.

In addition, in order to reduce rolling resistance, a large amount of white carbon black is used to replace carbon black in the formula for reinforcement. Because polar white carbon black has a stronger cohesion than non-polar carbon black, it is processed according to the usual mixing process Very difficult, there are phenomena such as uneven dispersion and gelation of the mixed rubber; at the same time, in order to improve the wear resistance, butadiene rubber with good wear resistance is used in the formula. When the amount of butadiene rubber is too large (more than 40 parts), it is easy to The rubber material slips and falls off the roll due to the fluctuation of the roller temperature. If the traditional mixing method is adopted, the rubber material will be mixed slowly, the mixing will be uneven, and the gel on the film surface will be serious, which will further increase the mixing efficiency. Difficulty in refining and processing; in addition, due to the high resilience and large shrinkage of the rubber compound after mixing, the dimensional stability of the semi-finished product after extrusion is very poor, which cannot meet the technical requirements of the process

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