Formula of recap rubber used by segmented mould and preparation process of recap rubber

Abstract

The invention discloses a formula of recap rubber used by a segmented mould and a preparation process of the recap rubber. The adoption of carbon black N234 and N330 which has higher wearability improves the wearability of tread rubber. The adoption of 29 parts by weight of natural rubber reduces the cost of raw materials and the tread rubber and causes the tread rubber to be more competitive in the market. The preparation process adopts two-section thin-pass plastication which is carried out for 10-12 times and a thin-pass mixing method and improves the uniformity and the physical property of the tread rubber.

Description

technical field [0001] The invention relates to a formula of tread rubber for retreading old tires and a production process thereof, in particular to a formula of tread rubber for retreading of old tires used in a joint mold and a production process thereof. Background technique [0002] The earliest retreading tires in my country used aluminum molds to heat the old tires and top them. At present, the cold turning process is mainly used, that is, the cold turning process is carried out with a vulcanization tank. The current vulcanization tank can vulcanize 6 to 24 pieces per tank, mainly for roofing and refurbishment, but if there is a problem with the sidewall, this method cannot solve it. In addition, the combination of the roof and the sidewall is not good, and it is easy to break. There were potential safety hazards. Later, the old tires were comprehensively refurbished using flexible molds in China, which solved the sidewall problem. Tread rubber is the main material f...

AI Technical Summary

Problems solved by technology

The current vulcanization tank can vulcanize 6 to 24 pieces per tank, mainly for roofing and refurbishment, but if there is a problem with the sidewall, this method cannot solve it. In addition, the combination of the roof and the sidewall is not good, and it is easy to break. There were potential safety hazards. Later, the old tires were comprehensively refurbished with flexible molds in China, which solved the sidewall problem.

Tread rubber is the main material for retreading tires. The quality of tread rubber directly determines the effect of old tire retreading. At present, the sulfur used in the traditional tread rubber formula is general sulfur, which is easy to bloom. The used DZ and PZ low-temperature vulcanization is easy to self-sulfur, the carbon black 220 used has poor wear resistance, and the engine oil is easy to penetrate into the rubber. The finished tread rubber produced is brittle and has poor toughness. There are safety hazards during exercise

At present, in the pre-vulcanization process of tread rubber, natural rubber is directly used without masticating natural rubber with an internal mixer. This process does not give full play to the leading role of natural rubber in the tread

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