Formula and preparation method of all-steel tire carcass

Abstract

The invention belongs to the technical field of tire formulas, and concretely relates to a formula and a preparation method of an all-steel tire carcass. The formula comprises, by mass, 70-95 parts ofnatural rubber, 5-30 parts of a trans-isoprene-butadiene copolymer, 50-60 parts of carbon black, 0.5-1.5 parts of a cobalt salt, 4-5 parts of ZnO, 0-2 parts of stearic acid, 2-3 parts of an antioxidant, 2-4 parts of insoluble sulfur, 1-2 parts of a promoter and 0.2-0.5 part of an anti-scorching agent CTP. The invention can improve the dynamic fatigue performance of the carcass formula and prolongthe service life of tires, and the high modulus caused by crystallization of the formula at normal temperature can effectively reduce exposed cords in tire cavities, caused by stretching during tiremolding, and improves the qualified rate of the product.

Description

technical field [0001] The invention belongs to the technical field of tire formulas, in particular to an all-steel tire carcass formula and a preparation method thereof. Background technique [0002] When truck and bus tires are running, the dynamic frequency is close to 10Hz, and the periodic compression deformation and high load capacity require the carcass to have excellent fatigue resistance. On the one hand, the tire carcass transmits the axle load to the crown through the rim, which plays the role of bearing, buffering and transmitting stress; on the other hand, it protects the tire from external impact damage. The surface of all-steel tire carcass steel wire is usually plated with copper and zinc, which can be combined with rubber through an adhesive system. The formula of carcass rubber requires good adhesion to steel wire, low heat generation, high modulus and fatigue performance. The current carcass formula has two defects: one is the poor dynamic fatigue perfor...

AI Technical Summary

Problems solved by technology

The current carcass formula has two defects: one is the poor dynamic fatigue performance caused by the high modulus, and the other is the stretching deformation caused by the low Green strength during the tire building process, and there is a phenomenon of thread leakage in the tire, which affects the safety performance of the product.

There are two solutions, one is to increase the green strength by increasing the carbon black filling, and at the same time cause the heat generation of the formula to increase, and the effect is limited

The other is pre-vulcanization technology, which improves the strength of the rubber compound through radiation pre-vulcanization. This technology requires high cost through equipment modification, and it is in the initial stage of the experiment, and it cannot improve the dynamic fatigue performance of the rubber-coated steel wire.